JI — 1, - -.7 z I I 1.11, 1lL.li^.~I. tiA.l i iiiittii IU 1 Ai L~iIAL l..1.ij -fT-m rn — ------ mnr -------— ~rmm~^?T~ff J THE AMERICAN PRIMARY SCHOOL ARITHMETIC: DESIGNED FOR THE USE OF PUPILS IN PRIMARY AND INTERMEDIATE SCHOOLS. BY JAMES ROBINSON, AUTHOR OF THE AMERICAN ARITHMETIC. BOSTON: PUBLISHED BY JOHN P. JEWETT & CO. 1851. Entered according to Act of Congress, in the year 1851, BY JAMIES ROBINSON, In the Clerk's Office of the District Court of the District of Massachusctts. STEREOTYE'Di BY O3BA T'1' & ROBBINS, NEW LECGLAN'D FTYPE AND STFEROTY' E FOUNDJ'IR, BOSTON. PREFACE. THE object of the author, in preparing this little work, has been to furnish lessons in Arithmetic for young children suited to their age and capacity. To accomplish this desirable object, care has been taken that they should be strictly progressive. Commencing, therefore, with the simplest elements and combinations of numbers, the lessons advance by easy and gradual steps, in the form of tables, interspersed with practical examples and simple exercises to be performed on the slate, until they conduct the pupil through the various operations, with numbers as high as 12, of Addition, Subtraction, Multiplication, and Division. Having completed the tables, Addition, Subtraction, Multiplication, and Division, and their appropriate arithmetical terms and signs, are clearly defined, and the methods of operation explained, and illustrated by appropriate examples. The Rules for their operation are also given, with exercises in larger numbers to be performed on the slate, followed by a few practical questions. It is believed that these slate exercises will furnish young children with pleasing employment, and facilitate, rather than retard, their progress in mental and oral arithmetic, and be found to be a valuable feature of the work. Fractions, with appropriate exercises, have also been explained, and introduced as extensively as would comport with the general design of the book Tables of money, weight, and measure, have been added, which may be learned by pupils in primary and intermediate schools. With this brief explanation of the object and plan of the work, the author commends it to the favorable notice of teachers, school committees, and the friends of education. J. R, MAY, 1851. TO TEACHERS. IT is presumed that most children have learned to count, to some extent, before they begin to attend school; yet it will be necessary that young pupils should be shown how many thing the name of each number denotes. The most convenient apparatus for this purpose is the Numerical Frame. The balls on the wires are easily arranged, and may be seen by every member of the class at the same time; and, with appropriate illustrations by tile teacher, pupils will readily perceive'that every number is composed of as many single things, or units, as its name indicates. If the school is not furnished with a numerical frame, the teacher can make use of unit-marks upon the blackboard for illustration. The author would suggest to those teachers who have had but little experience, that the introductory lessons should first be explained to the class; and that each of the succeeding lessons, in the order of their arrangement, should be given to the class, previous to recitation, with such explanations as shall be found necessary; and that the use of the book during recitation should be strictly prohibited. Questions should be asked promiscuously, and not in rotation; and no question should be asked or read more than once by the teacher, if done slowly and distinctly. The pupil should be required to repeat the question, and solve it, without being interrupted by the teacher, unless it be to make some criticism or correction. Care should be taken that the language of the pupil be strictly accurate, and that the best forms for the solution of problems should be carefully observed. Pupils who have learned the first fourteen lessons will be able to read and write the first one hundred and forty-four numbers. Lesson XVI. may be omitted until CXVI. lessons have been learned; then Lesson XVI. should be learned, before commencing operations upon the slate with larger numbers. THE AMERICAN PRIMARY SCHOOL ARITHMETIC. INTRODUCTORY LESSON. _DefJnitions and Illustrations. ARITHMETIC is the art of computing by numbers. "Numbers are the expressions of one or more things of the same kind." Any whole thing is called a unit, or one; as, one book, one slate, one pencil. Every number greater than one is composed of units, and each succeeding greater number contains one unit more than the preceding number. Thus: one and one more are two; two and one more are three; three and one more are four; four and one more are Jive; five and one more are six; six and one more are seven; seven and one more are eight; eight and one more are nine; nine and one more are ten; ten and one more are eleven; eleven and one more are twelve; and in this manner each succeeding greater number may be formed. One * 1 Seven -*****, 7 Two ** 2 Eight **8**,*,* 8 Three *** 3 Nine 9*** **** 9 Four,*** 4 Ten ***-**X *** 10 Five * -*** 5 Eleven x**<, **,** II1 Six' *,X< * 6 Twelve * -* *-, ** * < 12 Th'e above illustrations are designed to show the pupil that all numbers are composed of single units, and that the words one, two, three, ec., always express the same number of units, respectively; which should be indelibly impressed on the mind, and retained in the memory, of young children. ~6 ~ NOTATION AND NUMIERATION. LESSON I. NOTATION is writing numbers; Numeration is reading them. Numbers are written or expressed by words, by figures, and by capital letters. The Arabic method of expressing numbers by figures is used in all arithmetical computations. Ten figures are used, viz., the figure one (1), the figure two (2), the figure three (3), the figure four (4), the figLure five (5), the figure six (6), the figure seven (7), the figure eight (8), the figure nine (9), and the cipher (0); each of which expresses as many units as its name indicates. These ten figures are called the arithmetical alphabet. The Roman method of expressing numbers by letters is used in numbering the chapters of books, sections, &c. Seven letters are used, viz., I, V, X, C,, D, and M. The letter I expresses one; V, five; X, ten; L1, fifty; C, one hundred; D, five hundred; and M, one thousand. All numbers can be expressed by these ten figures, or seven letters, by combining and repeating them, which will be shown to some extent in the following lessons:-~ LESSON II. One 1 I. Two 2 2 II. Three 3 3 III. Four 4 4 IV. Five 5 5 V. Six' 6 6 VI. Seven 7 7 VII. Eight 8 VIII. Nine 9 9 IX. Ten 10 10 X. Eleven 11 // XI. Twelve 12 12 XTI. NOTATION AND NUMERATION. 7 LESSON III. Thirteen 13 XIII. Fourteen 14 - XIV. Fifteen 15 15 XV. Sixteen 16 16 XVI. Seventeen 17 17 XVII. Eighteen 18 1d XVIII. Nineeteen 19 /9 XIX. Twenty 20 20 XX. Twenty-one 21 2 XXI. Twenty-two 22 22 XXII. Twenty-three 23 23 XXIII. Twenty-four 24 24 XXIV. LESSON IV. Twenty-five 25 25 XXV. Twenty-six 26 26 XXVI. Twenty-seven 27 27 XXVII. Twenty-eight 28 2 XXVIII. Twenty-nine 29 29 XXIX. Thirty 30 30 XXX. Thirty-one 31 3J XXXI. Thirty-two 32 32 XXXII. Thirty-three 33 33 XXXIII. Thirty-four 34 34 XXXIV. Thirty-five 35 35 XXXV. Thirty-six 36 36 XXXVI. 8 INOTATION AND NUMERATION. LESSON V. Thirty-seven 37 37 XXXVII. Thirty-eight 38 3o XXXVIII. Thirty-nine 39 39 XXXIX. Forty 40;0 XL. Forty-one 41 4/ XLI. Forty-two 42 -2 XLII. Forty-three 43 J3 XLIII. Forty-four 44 44 XLIV. Forty-five 4 45 XLV. Forty-six 46 46 XLVI. Forty-seven 47 47 XLVII. Forty-eight 48 4 XLVIII. LESSON VI. Forty-nine 49 49 XLIX. Fifty 50 50 L. Fifty-one 51 5/ LI. Fifty-two 52 52 LII. Fifty-three 53 53 LII. Fifty-four 54 54 LIV. Fifty-five 55 55 LV. Fifty-six 56 56 LVI. Fifty-seven 57 57 LVII Fifty-eight 58 5o LVIII. Fifty-nine 59 59 LIX. Sixty 60 60 LX. NOTATION AND NUMERIAT[ON. 9 LESSON VII. Sixty-one 61 61 LXI. Sixty-two 62 62 LXII. Sixty-three 63 63 LXIII. Sixty-four 64 64 LXIV. Sixty-five 65 65 LXV. Sixty-six 66 66 LXVI. Sixty-seven 67 67 LXVII. Sixty-eight 68 6 o LXVIII. Sixty-nine 69 69 LXIX. Seventy 70 70 LXX. Seventy-one 71 7/ LXXI. Seventy-two 72 72 LXXII. LESSON VIII. Seventy-three 73 73 LXXIII. Seventy-four 74 74, LXXIV. Seventy-five 75 75 LXXV. Seventy-six 76 76 LXXVI. Seventy-seven 77 77 LXXVII. Seventy-eight 78 7Y LXXVIII. Seventy-nine 79 79 LXXIX. Eighty 80 gO LXXX. Eighty-one 81 Jf LXXXI. Eighty-two 82 &2 LXXXII. Eighty-three 83 J3 LXXXIII. Eighty-four 84,4; LXXXIV. 10 NOTATION AND NUMERATION. LESSON IX. Eighty-five 85 95 LXXXV. Eighty-six 86?6 LXXXVI. E-ighty-seven 87 &7 LXXXVII. Eighty-eight 88 ^ LXXXVIII. Eighty-nine 89 9 LXXIX. Ninety 90 0 XC. Ninety-one 91 9/ XCI. Ninety-two 92 92 XCII. Ninety-three 93 3 XCIII. Ninlty-four 94 9/a XCTIY, Ninety-five 95 XCV. Ninety-six 96 9 6 XCVI. LESSON X. Ninety-seven 97 97 XCVII. Ninety-eight 98 9 XCVIII. Ninety-nine 99 99 XCIX. One hundred 100 /00 C. One hundred and one 101 /0/ CI. One hundred and two 102,02 CII. One hundred and three 103 j03 CIII. One hundred and four 104 / 4 CIV. One hundred and five 105 /05 CV. One hundred and six 106 / 0 CVI. One hundred and seven 107 /J7 CVII. One hundred and eight 108 CVIII. /O LESSON LXX. 2 times 1 are 2 2 in 2 1 times 2 times 2 are 4 2 in 4 2 times-. 2 times 3 are 6 2 in 6 3 times. 2 times 4 are 8 2 in 8 4 times. 2 times 5 are 10 2 in 10 5 times. 2 times 6 are 12 2 in 12 6 times. 2 times 7 are 14 2 in 14 7 times. 2 times 8 are 16 2 in 16 8 times, 2 times 9 are 18 2 in 18 9 times. 2 times 10 are 20 2 in 20 10 times. 2 times 11 are 22 2 in 22 11 times. 2 times 12 are 24 2 in 24 12 times. LESSON LXXI. I time 2 are how many? What is 1 half of 2? ~ 2 times 2 are how many? What is 1 half of 4? 3 times 2 are how many? What is I half of 6? 4 times 2 are how many? What is 1 half of 8? 5 times 2 are hor many? What is I half of 10? 6 times 2 are how many? What is 1 half of 12? 7 times 2 are how many? What is 1 half of 14? 8 times 2 are how many? What is 1 half of 16? 9 times 2 are how many? What is I half of 18? 10 times 2 are how many? What is 1 half of 20? 11 times 2 are how many? What is 1 half of 22? 12 times 2 are how many? What is 1 half of 24? LESSON LXXII. EXERCISES TO BE PERFORMED ON THE SLATE. Cw/0 / X 10 11/ 2 222 2 2 2 iw v eA 2 I6 2 2 ^^ * When any number is divided into two equal parts, each part is called one half of the number, MULTIPLICATION AND DIVISION. 4S LESSON LXXIII. 1. If you pay one cent for an apple, how many cents must you pay for 2 apples? 2. If 2 peaches cost 2 cents, what will one peach cost? 3. A little girl has 2 hands; how many hands have 2 little girls? 4. 2 little girls have 4 eyes; how many eyes has one little girl? 5. Mary has 3 picture-books, and Jane has 2 times as many; how many picture-books has Jane? 6. Jane has 6 pears, and Mary has only one half as many; how many pears has Mary? 7. If one yard of ribbon cost 4 cents, how many cents will 2 yards cost? 8. If 2 oranges cost 8 cents, how many cents will one orange cost? t}, 9. If a quart of milk is worth 5 cents, how many cents are 2 quarts worth? 10. If 2 quarts of milk are worth 10 cents, how many cents is one quart worth? 11. If a loaf of bread is worth 6 cents, how many cents are 2 loaves worth? 12. If you have 12 cents, how many loaves of bread can you buy with them at 6 cents each? 13. What will 2 yards of cloth cost, at 7 dollars a yard? 14. If 2 yards of cloth cost 14 dollars, what is one yard of it worth? 15. Henry has 8 marbles, and James has 2 times as many; how many marbles has James? 16. William has 16 nuts, and Albert has only one half as many; how many nuts has Albert? 17. If a stage run 9 miles in an hour, how many miles will it run in 2 hours? 18. How many hours will it take a man to travel 18 miles, if he travel 9 miles an hour? 19. There are 10 dollars in a gold eagle; how many dollars are there in 2 eagles? 20. In 20 dollars, how many eagles are there of 10 dollars each? 44 MULTIPLICATION AND DIVISION. LESSON LXXIV. 3 times I are 3 3 in 3 1 time. 3 times 2 are 6 3 in 6 2 times. 3 times 3 are 9 3 in 9 3 times. 3 times 4 are 12 3 in 12 4 times. 3 times 5 are 15 3 in 15" 5 times. 3 times 6 are 18 3 in 18 6 times. 3 times T are 21 3 in 21 7 times. 3 times 8 are 24 3 in 24 8 times. 3 times 9 are 27 3 in 27 9 times. 3 times 10 are 30 3 in 30 10 times. 3 times 11 are 33 3 in 33 11 times. 3 times 12 are 36 3 in 36 12 times. LESSON LXXV. I time 3 are how many? What is 1 third of 3? 2 times 3 are how many? What is 1 third of 6? 3 times 3 are how many? What is 1 third of 9? 4 times 3 are how many? What is 1 third of 12? 5 times 3 are how many? What is 1 third of 15? 6 times 3 are how many? What is I third of 18? 7 times 3 are how many? What is 1 third of 21? 8 times 3 are how many? What is 1 third of 24? 9 times 3 are how many? What is 1 third of 27? 10 times 3 are how many? What is I third of 30? II times 3 are how many? Whhat is 1 third of 33? 12 times 3 are how many? What is 1 third of 36? LESSON LXXVI. EXERCISES TO BE PERFORMED ON THE SLATE. 7 3 9 8 // /8 8 3 3 33 3 3 3 Qfz{w 2 y 3 2 70 3 36? 6 * When any number is divided into three equal parts, each of the parts is called one third of the number. MIULTIPLICATION AND DIVISION. 45 LESSON LXXVII. 1. Sophia has one rose, and Maria has 3 times as many; how many roses has Maria? 2. Maria has 3 pinks, Sophia has only one third as many; how many pinks has Sophia'? 3. In one quart there are 2 pints; how many pints are there in 3 quarts? 4. There are 2 pints m one quart; how many quarts are there in 6 pints? 5. There are 3 feet in one yard; how many feet are there in 3 yards? 6. In one yard tlere are 3 feet; how many yards are there in 9 feet? 7. There are 4 farthings in one penny; how many farthings are there in 3 pence 8. In one penny there are 4 farthings; how many pence are there in 12 farthings? 9. If you recite 5 lessons each day, how many lessons will you recite in 3 days? 10. Charles recited 15 lessons in 3 days; how many lessons did he recite each day? 11. There are 6 shillings in one dollar; how many shillings are there in 3 dollars? 12. In one dollar there are 6 shillings; how many dollars are there in 18 shillings? 13. If one yard of broadcloth cost 7 dollars, what will 3 yards cost? 14. If 3 yards of broadcloth are worth 21 dollars, what is the value of one yard? 15. If a quart of cherries be worth 8 cents, what are 3 quarts worth? 16. If 3 quarts of cherries are worth 24 cents, how many cents is one quart worth? 17. If a pound of raisins cost 9 cents, how many cents will 3 pounds cost? 18. If 3 pounds of raisins are worth 27' cents, what is the value of one pound? 19. If a writing-book cost 10 cents, how many cents will 3 writing-books cost? 46 MULTIPLICATION AND 1IYISION. LESSON LXXVIII 4 times 1 are 4 4 in 4 1 time. 4 times 2 are 8 4 in 8 2 times. 4 times 3 are 12 4 in 12 3 times. 4 times 4 are 16 4 in'16 4 times. 4 times 5 are 20 4 in 20 5 times. 4 times 6 are 24 4 in 24 6 times. 4 times 7 are 28 4 in 28 7 times. 4 times 8 are 32 4 in 32 8 times. 4 times 9 are 36 4 in 36 9 times. 4 times 10 are 40 4 in 40 10 times. 4 times 11 are 44 4 in 44 11 times. 4 times 12 are 48 4 in 48 12 times. LESSON LXXIX. I time 4 are how many? What is 1 fourth of 4? 2 times 4 are how many? What is 1 fourth of 8? 3 times 4 are how many? What is 1 fourth of 12? 4 times 4 are how many? What is 1 fourth of 16? 5 times 4 are how many? What is 1 fourth of 20? 6 times 4 are how many? What is 1 fourth of 24? 7 times 4 are how many? What is 1 fourth of 28? 8 times 4 are how many? What is I fourth of 32? 9 times 4 are how many? VWVhat is 1 fourth of 36? 10 times 4 are how many? What is 1 fourth of 40? 11 times 4 are how many? What is 1 fourth of 44? 12 times 4 are how many? What is 1 fourth of 48? LESSON LXXX. EXERCISES TO BE PERFORMED ON THE SLATE. ^^ /r 8 9 /0 1/ /2 we2. l When any number is divided into four equal parts, each of the parts is called onefourth of the number. 3iMULTIPLIC(AT2ION AND DIVISION. 47 LESSON LXXXI. 1. Caroline writes one page of her writing-book in a day; how many pages does she write in 4 days? 2. Caroline has written 4 pages of her writing-book in 4 days; how many pages has she written each day? 3. A bird has 2 wings; how many wings have 4 birds? 4. How many pears, at 2 cents a-piece, can you buy with 8 cents? 5. How many cents will 4 oranges cost, at 3 cents a-piece? 6. If 4 oranges cost 12 cents, how many cents does one orange cost? 7. There are 4 quarts in one gallon; how many quarts are there in 4 gallons? 8. 4 quarts are equal to one gallon; how many gallons are there in 16 quarts? 9. There are 5 quarters in an English ell; how many quarters are there in 4 ells? 10. In an English ell there are 5 quarters; how many ells are there in 20 quarters? 11. There are 6 feet in one fathom; how many feet are there in 4 fathoms? 12. In one fathom there are 6 feet; how many fathoims are there in 24 feet? 13. If one barrel of four is worth 7 dollars, how many dollars are 4 barrels worth? 14. How many barrels of flour can you buy with 28 dollars, at 7 dollars a barrel? 15. What will 4 pounds of sugar come to, at 8 cents a pound? 16. How many pounds of beef can you purchase with 32 cents, at 8 cents a pound? 17. Thomas has 9 cents, and John has 4 times as many; how many cents has John? 18. John has 36 nuts; Thomas has only one fourth as many. How many nuts has Thomas? 19. If a pound of cheese is worth 10 cents, what is the value of 4 pounds? 48 rMULTIPLICATION AND DIVISION, LESSON LXXXII. 5 times I are 5 5 in 5 1 time. 5 times 2 are 10 5 in 10 2 times. 5 times 3 are 15 5 in 15 3 times. 5 times 4 are 20 5 in 20 4 times. 5 times 5 are 25 5 in 25 5 times. 5 times 6 are 30 5 in 30 6 times. 5 times 7 are 35 5 in 35 7 times. 5 times 8 are 40 5 in 40 8 times. 5 times 9 are 45 5 in 45 9 times. 5 times 10 are 50 5 in 50 10 times. 5 times 11 are 55 5 in 55 11 times. 5 times 12 are 60 5 in 60 12 times. LESSON LXXXIII. 1 time 5 are how many? What is 1 fifth of 5? * 2 times 5 are how nmany? What is 1 fifth of 10? 3 times 5 are how many? What is 1 fifth of 15? 4 times 5 are how many? What is I fifth of 20? 5 times 5 are how many? What is 1 fifth of 25? 6 times 5 are how many? What is 1 fifth of 30? 7 times 5 are how many? What is I fifth of 35? 8 times 5 are how many? What is 1 fifth of 40? 9 times 5 are how many? What is I fifth of 45? 10 times 5 are how many? What is 1 fifth of 50? 11 times 5 are how many? What is 1 fifth of 55? 12 times 5 are how many? What is 1 fifth of 60? LESSON LXXXIV. EXERCISES TO BE PERFORMED ON THE SLATE. ^^ / 8 f /o // /9 <,5 5 5 5 5 5 ae35 355 O y 5 55 y 5 When any number is divided into five equal parts, each of the parts is called one fifth of the number. MULTIPLICATION AND DIVISION. 49 LESSON LXXXV. 1. If Maria walks one mile each morning, how many miles will she have walked in 5 mornings? 2. Maria has walked 5 miles in 5 mornings; how many miles did she walk each morning? 3. A cow has 2 horns; how many horns have 5 cows? 4. William has 10 apples; Henry has only one fifth as many. How many apples has Henry? 5. If the postage on a letter is 3 cents, what will be the postage on 5 letters? 6. In one yard there are 3 feet; how many yards are there in 15 feet? 7. There are 4 quarters in one yard; how many quarters are there in 5 yards? 8. There are 4 quarts in one gallon; how many gallons are there in 20 quarts? 9. If a skein of silk is worth 5 cents, what is the value of 5 skeins? 10. How many skeins of silk can you purchase with 25 cents, at 5 cents a skein? 11. If a barrel of flour cost 6 dollars, how many dollars will 5 barrels cost? 12. If 5 yards of broadcloth are worth 30 dollars, how many dollars is one yard worth? 13. There are 7 days in a week; how many days are there in 5 weeks? 14. In one week there are 7 days; how many weeks are there in 35 days? 15. There are 8 gills in one quart; how many gills are there in 5 quarts? 16. In one quart there are 8 gills; how many quarts are there in 40 gills? 17. If one apple-tree bears 9 bushels of apples, how many bushels will 5 trees bear? 18. A farmer picked 45 bushels of apples from 5 trees; how many bushels were picked from each tree? 19. If a girl perform 10 questions in arithmetic in one day, how many will she perform in 5 ldays? 5 50 MULTIPLICATION AN]D DIVISION. LESSON LXXXVI. 6 times 1 are 6 6 in 6 1 time. 6 times 2 are 12 6 in 12 2 times. 6 times 3 are 18 6 in 18 3 times. 6 times 4 are 24 6 in 24 4 times. 6 times 5 are 30 6 in 30 5 times. 6 times 6 are 36 6 in 36 6 times. 6 times 7 are 42 6 in 42 7 times. 6 times 8 are 48 6 in 48 8 times. 6 times 9 are 54 6 in 54 9 times. 6 times 10 are 60 6 in 60 10 times. 6 times 11 are 66 6 in 66 11 times. 6 times 12 are 72 6 in 72 12 times. LESSON LXXXVII. I time 6 are how many? What is I sixth of 6? - 2 times 6 are how many? What is 1 sixth of 12? 3 times 6 are how many? What is 1 sixth of 18? 4 times 6 are how many? What is I sixth of 24? 5 times 6 are how many? What is 1 sixth of 30? 6 times 6 are how many? What is 1 sixth of 36? 7 times 6 are how many? What is 1 sixth of 42? 8 times 6 are how many? What is I sixth of 48? 9 times 6 are how many? What is 1 sixth of 54? 10 times 6 are how many? What is 1 sixth of 60? 11 times 6 are how many? What is 1 sixth of 66? 12 times 6 are how many? What is 1 sixth of 72? LESSON LXXXVIII. EXERCISES TO BE PERFORMED ON THE SLATE. ^i37 8 Y 9 0 // /2 6 6 6 6 6 6 ^m^cg ^Add6 6,6 6 7 6 * When any nullber is divided into six equal parts, each of the parts is called one sixth of the number. MIULTIPLICATION AND DIVISION. 51 LESSON LXXXIX. 1. If a tailoress can make one vest in a day, how many can she make in 6 days? 2. If a tailoress can make 6 vests in 6 days, how many can she make in one day? 3. If Mary writes 2 copies each day, how many will she write in 6 days? 4. Julia has written 12 pages in 6 days; how many pages has she written each day? 5. If you give 6 girls 3 apples each, how many apples do you give away? 6. If 18 peaches be equally divided among 6 boys, how many will each boy have? 7. If you should buy 6 oranges, and pay 4 cents a-piece for them, how many cents would the oranges cost? 8. If you pay 24 cents for 6 yards of tape, how many cents is one yard of it worth? 9. William has 5 cents, and James has 6 times as many; how many cents has James? 10. If 30 cents be put into 6 equal piles, how many cents will there be in each pile? 11. What will 6 lead-pencils cost, at 6 cents a-piece? 12. If one yard of cloth is worth 6 dollars, how many yards can you purchase with 36 dollars? 13. If a girl can make 7 palm-leaf hats in a week, how many can she make in 6 weeks? 14. A cabinet-maker sold 7 tables for 42 dollars; how many dollars did he get for each of them? 15. There are 8 pints in one gallon; how many pints are there in 6 gallons? 16. In one gallon there are 8 pints; how many gallons are there in 48 pints? 17. If a yard of cloth is worth 9 cents, what are 6 yards of it worth? 18. A girl paid 54 cents for 6 yards of calico; how many cents did she pay for each yard? 19. If one pound of beef is worth 12 cents, what is the value of 6 pounds? 52 IMULTIPLICATION AND DIVISION. LESSON XC. 7 times 1 are 7 7 in 7 1 time. 7 times 2 are 14 7 in 14 2 times. 7 times 3 are 21 7 in 21 3 times. 7 times 4 are 28 7 in 28 4 times. 7 times 5 are 35 7 in 35 5 times. 7 times 6 are 42 7 in 42 6 times. 7 times 7 are 49 7 in 49 7 times. 7 times 8 are 56 7 in 56 8 times. 7 times 9 are 63 7 in 63 9 times. 7 times 10 are 70 7 in 70 10 times. 7 times 11 are 77 7 in 77 11 times. 7 times 12 are 84 7 in 84 12 times. LESSON XCI. I time 7 are how many? What is I seventh of 7? 2 times 7 are how many? What is 1 seventh of 14? 3 times 7 are how many? What is 1 seventh of 21? 4 times 7 are how many? What is 1 seventh of 28? 5 times 7 are how many? What is 1 seventh of 35? 6 times 7 are how many? What is 1 seventh of 42? 7 times 7 are how many? What is 1 seventh of 49? 8 times 7 are how many? What is 1 seventh of 56? 9 times 7 are how many? What is 1 seventh of 63? 10 times 7 are how many? What is 1 seventh of 70? 11 times 7 are how many? What is 1 seventh of 77? 12 times 7 are how many? What is 1 seventh of 84? LESSON XCII. EXERCISES TO BE PERFOiRMED ON THE SLATE. J^^/2 8 g ^0o / A2 ~/.7 7 7 7 7,7( 3 77e l7 63? ~ When any number is divided into seven equal parts, each of the parts is called one seventh of the number. MULTIPLICATION AND DIVISION. 53 LESSON XCIII. 1. If one gallon of wine cost 2 dollars, what will 7 gallons cost? 2. A man paid 14 dollars for 7 sheep; how many dollars did each sheep cost him? 3. If one biscuit cost 3 cents, what will 7 biscuits cost? 4. At 3 cents a-piece, how many biscuits can you purchase with 21 cents? 5. There are 4 weeks in one month; how many weeks are there in 7 months? 6. In one month there are 4 weeks; how many months are there in 28 weeks? 7. If a man earn 5 dollars in one day, how many dollars can he earn in 7 days? 8. If a man's expenses be 35 dollars a week, how much is that a day? 9. There are 7 boys, and each boy has 6 cents; how many cents have all of them? 10. If you divide 42 nuts equally among 7 boys, how many nuts will each boy receive? 11. If a boy earn 7 dollars in one month, how many dollars can he earn in 7 months? 12. A boy received 49 dollars for 7 months' labor; how many dollars did le receive for each month's labor? 13. There are 8 quarts in one peck; how many quarts are there in 7 pecks? 14. In one peck there are 8 quarts; how many peeks are there in 56 quarts? 15. William has 9 cents, and Henry has 7 times as many; how many cents has Henry? 16. Henry has 63 cents, and William has only one seventh as many; how many cents has William? 17. If you can learn 10 questions in an hour, how many questions can you learn in 7 hours? 18. If you are required to learn 70 questions in arithnmetic, and wish to learn them all in 7 hours, how many of them must you learn each hour? 19. In one shilling there are'12 pence; how many pence are there in 7 shillings? 5, 54 MULTIPLICATION AND DIVISION. LESSON LXACIV. 8 times 1 are 8 8 in 8 1 time. 8 times 2 are 16 8 in 16 2 times. 8 times 3 are 24 8 in 24 3 times 8 times 4 are 32 8 in 32 4 times. 8 times 5 are 40 8 in 40 5 times. 8 times 6 are 48 8 in 48 6 times. 8 times 7 are 56 8 in 56 7 times. 8 times 8 are 64 8 in 64 8 times. 8 times 9 are 72 8 in 72 9 times. 8 times 10 are 80 8 in 80 10 times. 8 times 11 are 88 8 in 88 11 times. 8 times 12 are 96 8 in 96 12 times. LESSON XCV. 1 time 8 are how many? Wrhat is I eighth of 8? 2 times 8 are how many? What is 1 eighth of 16? 3 times 8 are how many? What is 1 eighth of 24? 4 times 8 are how many? What is 1 eighth of 32? 5 times 8 are how many? What is 1 eighth of 40? 6 times 8 are how many? What is 1 eighth of 48? 7 times 8 are how many? What is I eighth of 56? 8 times 8 are how many? What is 1 eighth of 64? 9 times 8 are how many? What is I eighth of 72? 10 times 8 are how many? What is 1 eighth of 80? 11 times 8 are how many? What is I eighth of 88? 12 times 8 are how many? What is 1 eighth of 96? LESSON XCVI. EXERCISES TO BE PERFORMED ON THE SLATE. W;;Z 17 882 16 1 12 * When any number is divided into eight equal parts, each of the parts is called one eighth of the number. MULTIPLICATION AND DIVISION. 55 LESSON XCVII. 1. A man purchased 8 barrels of apples, at 2 dollars a barrel; how manay dollars did the 8 barrels cost him? 2. How many pears can you buy with 16 cents, at 2 cents a-piece r 3. What will 8 barrels of cider cost, at 3 dollars a barrel? 4. How many oranges can you buy with 24 cents, at 3 cents a-piece:? 5. Francis has 4 mlarbles, and John has 8 times as many; how many marbles has John? 6. If 32 marbles be equally divided among 8 boys, how many marbles will each boy receive? 7. What will 8 weeks' board come to, at 5 dollars a week? 8. HIow many yards of cloth can you purchase with 40 dollars, at 5 dollars a yard? 9. A man has 8 children, and gives 6 dollars to each of them; how many dollars does he give away? 10. A mother distributed 48 peaches equally among her 8 children; how many did she give them a-piece? 11. In one week there are 7 days; how many days are there in 8 weeks? 12. There are 7 days in one week; how many weeks are there in 56 days? 13. If a man can earn 8 dollars in one week, how many dollars can he earn in 8 weeks? 14. If 64 boys be divided into classes, containing 8 boys each, how many classes would there be? 15 If a vessel sail 9 miles in an hour, how many miles will she sail in 8 hours? 16. How many hours will it take a man to travel 72 miles, if he travels 9 miles in an hour? 17. There are 10 cents in one dime; how many cents are there in 8 dimes? 18. In one dime there are 10 cents; how many dimes are there in 80 cents? 19. If one ton of hay is worth 11 dollars, what are 8 tons worth? 56 MULTIPLICATION AND DIVISION. LESSON XCVIII. 9 times 1 are 9 9 in 9 1 time. 9 times 2 are 18 9 in 18 2 times. 9 times 3 are 27 9 in 27 3 times. 9 times 4 are 36 9 in 36 4 times. 9 times 5 are 45 9 in 45 5 times. 9 times 6 are 54 9 in 54 6 times. 9 times 7 are 63 9 in 63 7 times. 9 times 8 are 72 9 in 72 8 times. 9 times 9 are 81 9 in 81 9 times. 9 times 10 are 90 9 in 9010 times. 9 times 11 are 99 9 in 9911 times. 9 times 12 are 108 9 in 108 12 times. LESSON XCIX. 1 time 9 are how many? What is 1 ninth of 9? 2 times 9 are how many? What is 1 ninth of 18? 3 times 9 are how many? What is 1 ninth of 27? 4 times 9 are how many? What is I ninth of 36? 5 times 9 are how many? What is I ninth of 45? 6 times 9 are how many? What is I ninth of 54? 7 times 9 are how many? What is 1 ninth of 63? 8 times 9 are how many? What is 1 ninth of 72? 9 times 9 are how many? What is 1 ninth of 81? 10 times 9 are how many? What is 1 ninth of 90? 11 times 9 are how many? What is I ninth of 99? 12 times 9 are how many? What is 1 ninth of 108? LESSON C. EXERCISES TO BE PERFORMED ON THE SLATE. 1./ 8 7 0 / / 12 7 2 _f 9 9 2 9 ~ When any number is divided into nine equal parts, each of the parts is called one ninth of the number. MIULTIPLICATION AND DIVISION. 57 LESSON CI. 1. What will 9 yards of cloth cost, at 2 dollars a yard? 2. How many barrels of apples can you buy with 18 dollars, at 2 dollars a barrel? 3. There are 3 miles in one league; how many miles are there in 9 leagues? 4. In one league there are 3 miles; how many leagues are there in 27 miles? 5. In one yard there are 4 quarters; how many quarters are there in 9 yards? 6. How many yards are there in 36 quarters of a yard? 7. If a quart of milk cost 5 cents, how many cents will 9 quarts cost? 8. How many quarts of milk can you buy with 45 cents, at 5 cents a quart? 9. If one book cost 6 cents, what will 9 books cost? 10. If you pay 54 cents for 9 books, how many cents do you pay for each book? 11. How much will 9 yards of ribbon cost, at 7 cents a yard? 12. If a stage runs 63 miles in 9 hours, how many miles does it run each hour? 13. If a man earn 8 dollars in one week, how many dollars can he earn in 9 weeks? 14. A man received 72 dollars for 9 weeks' work; how many dollars did he receive for each week's work? 15. What will 9 pounds of sugar come to, at 9 cents a pound? 16. If 1S cents be equally divided among 9 boys, how many cents will each boy receive? 17. If one pound of coffee cost 10 cents, how many cents will 9 pounds cost? 18. How many writing-books, at 10 cents each, can you buy with 90 cents? 19. If 11 men can do a piece of work in 9 days, how many men will be required to do the same work in one day? 20. If 99 nuts be equally distributed among 9 boys, how many nuts will each boy receive.? 58 MULTIPLICATION AND DIVISION. LESSON CIT. 10 times 1 are 10 10 in 10 1 time. 10 times 2 are 20 10 in 20 2 times. 10 times 3 are 30 10 in 30 3 times. 10 times 4 are 40 10 in 40 4 times. 10 times 5 are 50 10 in 50 5 times. 10 times 6 are 60 10 in 60 6 times. 10 times 7 are 70 10 in 70 7 times. 10 times 8 are 80 10 in 80 8 times. 10 times 9 are 90 10 in 90 9 times. 10 times 10 are 100 10 in 100 10 times. 10 times 11 are 110 10 in 110 11 times. 10 times 12 are 120 10 in 120 12 times. LESSON CIII. 1 time 10 are how many? What is 1 tenth of 10? 2 times 10 are how many? What is 1 tenth of 20? 3 times 10 are how many? What is 1 tenth of 30? 4 times 10 are how many? What is 1 tenth of 40? 5 times 10 are how many? What is 1 tenth of 50? 6 times 10 are how many? What is 1 tenth of 60? 7 times 10 are how mahy? What is I tenth of 70? 8 times 10 are how many? What is 1 tenth of 80? 9 times 10 are how many? What is 1 tenth of 90? 10 times 10 are how many? What is 1 tenth of 100? 1 times 10 are how many? What is 1 tenth of 110? 12 times 10 are how many? What is 1 tenth of 120? LESSON CIV. EXERCISES TO BE PERFORMED ON THE SLATE. ^0: /10 /0 /0 /0 /0, y vofo fno O o o o * When any number is divided into ten equal parts, each of the parts is called one tenth of the number. MULTIPLICATION AND DIVISION. 59 LESSON CV. 1. If one lemon is worth 2 cents, what are 10 lemons worth? 2. How many peaches can you buy with 20 cents, at 2 cents a-piece? 3. If you give 10 boys 3 apples each, how many apples will you give to all of them? 4. If 30 roses be equally divided among 10 girls, how many roses will each girl receive? 5. Susan is 4 years old, which is one tenth the age of her mother; how old is her mother? 6. Mrs. Williams is 40 years old; her daughter Susan is only one tenth the age of her mother. How old is Susan? 7. If one lead-pencil is worth 5 cents, what are 10 pencils worth? 8. How many yards of broadcloth can you purchase with 50 dollars, at 5 dollars a yard? 9. If you pay 6 cents for riding one mile, how many cents must you pay for riding 10 miles? 10. AMary paid 60 cents for 10 yards of ribbon; how many cents did she pay for each yard? 11. What will 10 pounds of figs come to, at 7 cents a pound? 12. Bought 10 pounds of sugar for 70 cents; what is one pound of it worth? 13. There are 8 pints in one gallon; how many pints are there in 10 gallons? 14. 8 pints are equal to one gallon; 80 pints are equal to how many gallons? 15. If a man earn 9 dollars in one week, how many dollars can he earn in 10 weeks? 16. If 90 dollars be equally divided among 10 men, how many dollars will each man receive? 17. In al school there are 10 classes; in each class there are 10 girls. How many girls are there in the school? 18. In a school of 100 boys there are 10 divisions; each division contains the same number of boys. How many boys alre there in each division? 60 BIULTIPLICATION AND DIVISION. LESSON CVI. 11 times 1 are II 11 in 11 time. 11 times 2 are 22 11 in 22 2 times. I1 times 3 are 33 11 in 33 3 times. 11 times 4 are 44 11 in 44 4 times. 11 times 5 are 55 11 in 55 5 times. 11 times 6 are 66 11 in 66 6 times. 11 times 7 are 77 11 in 77 7 times. 11 times 8 are 88 11 in 88 8 times. 11 times 9 are 99 11 in 99 9 times. 11 times 10 are 110 11 in 110 10 times. 11 times 11 are 121 11 in 121 11 times. 11 times 12 are 132 11 in 132 12 times. LESSON C VII. I time 11 are how many? What is 1 eleventh of 11? 2 times 11 are how many? What is 1 eleventh of 22? 3 times 11 are how many? What is 1 eleventh of 33? 4 times 11 are how many? What is 1 eleventh of 44? 5 times 11 are how many? What is 1 eleventh of 55? 6 times 11 are how many? What is I eleventh of 66? 7 times 11 are how many? What is 1 eleventh of 77? 8 times 11 are how many? What is 1 eleventh of 88? 9 times 11 are how many? What is 1 eleventh of 99? 10 times ll are how many? What is I eleventh of 110? 11 times 11 are how many? What is 1 eleventh of 121? 12 times 11 are how many? What is I eleventh of 132? LESSON CVTII. EXERCISES TO BE PERFORMED ON THE SLATE. 5H^ / 8 7 9o - Y / / // // // // // // * When any number is dividedl into eleven equal parts, each of the parts-is called one elevclldh of the luilber. MULTIPLICATION AND DIVISION. 61 LESSON CIX. 1. Lucy bought 2 yards of ribbon, at 11 cents a yard; how many cents did she pay for it? 2. If 2 barrels of beef cost 22 dollars, what is one barrel of it worth? 3. There are 1f half-yards in one rod; how many halfyards are there in 3 rods? 4. Emily paid 33 cents for 3 yards of silk braid; how many cents did it cost per yard? 5. If one book cost 11 cents, how many cents would 4 books cost? 6. If 4 loads of hay can be purchased for 44 dollars, what would one load of it cost? 7. What will 5 pounds of cheese come to, at 11 cents a pound? 8. If 55 nuts be equally divided among 3 boys and 2 girls, how many nuts will each of them receive? 9. There are 6 shillings in one dollar; how many shillings are there in 11 dollars? 10. A lady paid 66 shillings for a piece of silk measuring 11 yards; what did each yard of it cost? 11. In one week there are 7 days; how many days are there in 11 weeks? 12. If 77 acres of land should be divided into 11 equal parts, how many acres would each part contain 13. If one ounce of nutmegs cost 11 cents, what will S ounces cost? 14. A farmer purchased 11 pounds of sugar, for which he paid 88 cents; what did it cost him per pound? 15. If 11 men can perform a piece of work in 9 days, how many men would be required to perform the same in one day? 16. If 99 men can perform a piece of work in one day, how many men would be required to perform the same in 11'days? 17. There are 10 cents in one dime; how many cents are there in 11 dimes? 18. How many pounds of coffee can you purchase with 110 cents, at 11 cents a pound? 6 62 MULTIPLICATION AND DIVISION. LESSON CX. 12 times 1 are 12 12 in 12 1 time. 12 times 2 are 24 12 in 24 2 times. 12 times 3 are 36 12 in 36 3 times. 12 times 4 are 48 12 in 48 4 times. 12 times 5 are 60 12 in 60 5 times. 12 times 6 are 72 12 in 72 6 times. 12 times 7 are 84. 12 in 84 7 times. 12 times 8 are 96 12 in 96 8 times. 12 times 9 are 108 12 in 108 9 times. 12 times 10 are 120 12 in 120 10 times. 12 times 11 are 132 12 in 13'2 11 times. 12 times 12 are 144 12 in 144 12 times. LESSON CXI. I time 12 are how many? What is 1 twelfth of 12? 2 times 12-are how many? What is 1 twelfth of 24? 3 times 12 are how many? What is 1 twelfth of 36? 4 times 12 are how many? What is I twelfth of 48? 5 times 12 are how many? What is I twelfth of 60? 6 times 12 are how many?- What is 1 twelfth of 72? 7 times 12 are how many? What is I twrelth of 84? 8 times 12 are how many? What is I twelfth of 96? 9 times 12 are how lmany? aWhat is I twelfth of 108? 10 times 12 are how many? What is 1 twelfth of 120? 11 times 12 are how many? What is 1 twelfth of 132? 12 times 12 are how many? What is I twelfth of 144? LESSON CXII. EXERCISES TO BE PERFORMED ON THE SLATE. ce we 7' / 8 2 y 0 // /2 62/1 /2 /1 12 12 12 S>m^e SAy2 96 dy2 Xz/^y * When any number is divided into twelve equal parts, each of the parts is called one twelfth of the number. MUrLTIPLICATION AND DIVISION. 63 LESSON CXIII. 1. If one pair of shoes are worth 2 dollars, what are 12 pairs worth? 2. Bought 12 pairs of shoes, for which I paid 24 dollars; how much did the shoes cost per pair? 3. One yard is equal to 3 feet; how many feet are there in 12 yards? 4. A grocer sold 3 pounds of raisins for 36 cents; what was the price per pound? 5. A half-dime is ecual to 5 cents; 12 half-dimes are equal to how many cents? 6. 5 dollars are equal to one half-eagle; 60 dollars are equal to how many half-eagles? 7. There are 6 shillings in one dollar; how many shillings are there in 12 dollars? 8. A boy placed 72 cents in 6 equal piles; how many cents did he place in each pile? 9. Henry has 7 cents, and Samuel has 12 times as many; how many has Samuel? 10. A drover purchased 12 sheep, for which he paid 84 dollars; what did each sheep cost? 11. What will 12 cords of wood come to, at 8 dollars a cord? 12. In one year there are 12 months; how many years are there in 96 months? 13. When sugar is worth 9 cents a pound, what must be paid for 12 pounds? 14. There are 12 pence in one shilling; how many shillings are there in 108 pence? 15. When eggs are worth 12 cents per dozen, what must be paid for 10 dozen? 16. 12 eggs are called a dozen; 120 eggs are equal to how many dozen? 17.. A lady purchased 12 yards of cambric, for which she paid 11 cents a yard; what did she pay for the 12 yards? 18. A man purchased 12 tons of coal, for which he paid 132 dollars; what did it cost him per ton? 64 MULTIPLICATION AND DIVISION. LESSON CXIV. MULTIPLICATION AND DIVISION COMBINED. 1. 3 times 4 are how many times 2? Solution. - 3 times 4 are 12; and 2 is contained in 12 6 times. Therefore, 3 times 4 are 6 times 2. 2. 3 times 8 are how many times 4? 6? 3. 3 times 10 are how many times 5? 6? 4. 3 times 12 are how many times 6? 9? 5. 4 times 6 are how many times 8? 3? 6. 4 times 5 are how many times 10? 2? 7. 4 times 10 are how many times 3? 8? 8. 4 times 9 are how many times 12? 6? 9. 5 times 6 are how many times 10? 3? 10. 5 times 8 are how many times 4? 10? 11. 6 times 3 are how many times 9? 2? 12. 6 times 6 are how many times 4? 9? 13. 6 times 8 are how many times 12? 4? 14. 7 times 10 are how many times 5? 10? 15. 8 times 3 are how many times 6? 12? 16. 8 times 9 are how many times 12? 6? 17. 8 times 10 are how many times 5? 10? 18. 8 times 12 are how many times 6? 12? 19. 9 times 2 are how many times 6? 3? 20. 9 times 8 are how many times 12? 6? 21. 9 times 10 are how many times 59 10? 22. 9 times 12 are how many times 6? 12? 23. 10 times 2 are how many times 4? 5? 24. 10 times 3 are how many times 5? 10? 25. 10 times 4 are how many times 8? 5? 26. 10 times 6 are how many times 12? 6? 27. 10 times 9 are how many times 6? 9? 28. 11 times 6 are how many times 3? 6? 29. 11 times 8 are how many times 4? 8? 30. 11 times 10 are how many times 5? 10? 31. 11 times 12 are how many times 6? 12? 32. 12 times 3 are how many times 4? 9? 33. 12 times 4 are how many times 8? 4? 34. 12 times 6 are how many times 9? 8? MTULTTIPLICATION AND DIVISION. Go5 LESSON CXV. PRACTICAL QUESTIONS COMBINING MULTIPLICATION AND DIVISION. 1. If 2 oranges cost 4 cents, what will 3 oranges cost? Solution. -If 2 oranges cost 4 cents, 1 orange will cost one half of 4 cents, which is 2 cents. If 1 orange cost 2 cents, 3 oranges will cost three times 2 cents, which are 6 cents; therefore, 3 oranges will cost 6 cents. 2. If 3 melons cost 24 cents, how many cents will 4 melons cost? 3. If 4 peaches cost 8 cents, what will 6 peaches cost? 4. If 5 pine-apples cost 60 cents, how many cents will 8 pine-apples cost? 5. If 6 pears cost 18 cents, what will 10 pears cost? 6. If 7 slates cost 70 cents, how many cents will 12 slates cost? 7. If 8 quarts of milk cost 40 cents, what will 12 quarts cost? 8. If 9 quarts of strawberries cost 108 cents, how many cents will 12 quarts, cost? 9. If 10 dozen eggs cost 120 cents, what will 12 dozen eggs cost? 10. If 4 sheep cost 12 dollars, how many dollars will 9 sheep cost? 11. If 5 calves cost 30 dollars, how many dollars will 8 calves cost? 12. If 6 men cut 18 cords of wood in one day, how many cords will 10 men cut in the same time? 13. If 6 men can do a piece of work in 5 days, in how many days can 5 men do the same work? 14. How many men will it take to do as much work in 6 days as 4 men can do in 12 days?, 15. How many days will it take 5 men to accomplish what it takes 6 men 10 days to perform? 16. In how many days can 12 men earn as much as 9 men can earn in 8 days? (is p z 6G MULTIPLICATION AND DIVISION. LESSON CXVI. 1. If 2 barrels of flour cost 10 dollars, what will 5 barrels cost? 2. 10 is 2 fifths of what number? 3. If 4 yards of cloth cost 40 cents, what will 9 yards cost? 4. 90 is 9 times I fourth of what number? 5. If 5 books cost 60 cents, what will 12 books cost? 6. 60 is 5 twelfths of what number? 7. 144 is 12 times 1 fifth of what number.? 8. If 6 lead-pencils cost 36 cents, what will 11 leadpencils cost? 9. 36 is 6 elevenths of what number? 10. 66 is 11 times 1 sixth of what'number 11. If 7 cuarts of cherries are worth 56 cents, what are 10 cuarts worth? 12. 56 is 7 tenths of what number? 13. 80 is 10 times I eighth of what number? 14. If 8 boxes of strawberries are worth 160 cents, what are 12 boxes worth? 15. 160 is 8 twelfths of what number? 16. 240 is 12 times 1 eighth of what number? 17. If 9 pears are worth 27 cents, what are 5 of them worth? 18. 27 is 9 times I fifth of what number? 19. 15 is 5 ninths of what number? 20. If a turkey weighing 10 pounds cost 120 cents, what will a turkey weighing 7 pounds cost? 21. 120 is 10 times I seventh of what number? 22. 84 is 7 tenths of what number? 23. William says to Henry, who is 10 years old, your age is 1 eighth of 4 times my age; how old is Williai? 24. 10 is 1 eighth of 4 times what number? 25. 80 is 8 times 1 fourth of what number? 26. A lady being asked her age, answered, that her youngest daughter was 12 years old, which was 1 twelfth of 3 times her own age; what was the lady's age? 27. 144 is 12 times I fourth of what number? 28. 48 is 1 third of twelve times what number? LESSON CXVII, ADDITION. ADDITION'iS the method of fincldg te total number of units contained in two or more numbers, and expressing them in one number, called the amount, or sum. Illustration. - A man has three bags of money. No. 1 contains 950 dollars; No. 2 contains 875 dollars; No. 3 contains 764 dollars. What is the total amount or sum of money in the three bags? We begin at the bottom of the colu s mn of units, and add all the figures in that column, and find the sum of 950 them to be 9 units, which we write 875 under the column of units. We then 764 add all the figures in the column of Ans. 2,589 dolls. tens, and find the sum of them to be 18 tens, or 1 hundred, and 8 tens; we write the 8 (tens) under the column of tens, and then add the 1 (hundred) with the figures in the column of hundreds, and find the sum of them to be 25 hundred, or 2 thousand, and 5 hundred; we write the 5 (hundred) under the column of hundreds, and the 2 (thousand) at the left of the 5 hundred; and find the whole amount or sum of money in the three bags to be 2,589 dollars. From the above illustration, we obtain the following RXTLE. - Write the numbers, placing units under units, ten.s under tens, hundreds under hundreds, and draw a line under them. Beyin at the bottom of the column of units, and add all tie fig/ures in that column in succession: if the amount does not exceed nine, write it under the column; if the amount exceeds nine, write the right-hand figure of it under the column, and add the left-hand zfiure, or fgures,with the igures in the next column. Add the figures in each succeeding column in the same manner, and write down the whole amount of the last co 7lumn. 68 8 ADD:TION. LESSON CXVIIX. EXERCISES TO BE PERFORMED ON THE SLATE. (1.) (2.) (3.) (4.) 123 567 222 666 234 678 333 777 355 789 444 888 466 912 555 999 (5.) (6.) (7.) (8.) 1,234 2,345 3,456 4,444 5,678 5,432 4,444 5,555 9,123 3,456 5,656 6,666 4,567 6,543 6,767 7,777 8.934 4,567 7,878 8,888 (9.) (10.) (11.) (12.) 11,111 23,232 22,333 34,435 22,222 34,343 33,444 45,546 33,333 45,454 44,555 56.654 44,444 56,565 55,666 67,765 55,555 67,676 66,777 78,786 66,666 78,787 77,888 89,987 Two short parallel lines ( ) indicate equality: thus, I dollar = 100 cents; which is read, 1 dollar is equal to 100 cents. This cross ( ) indicates addition:. thus, 5 + 7 = 12; which is read, 5 plus 7 equal 12, or 5 and 7 equal 12. 13. What is the sum of 5,665 + 6,545 + 7,546 + 8,564? 14. What is the sum of 23,456 + 34,567 + 45,678 --- 56,789? 15. What is the sum of 40,405 + 50,604 -- 60,708 + 70,910? 16. What is the sum of 75,704 + 85,406 - 95,115 + 48,412? 17. What is the sum of 48,444 + 57,555 + 66,333 + 99,999? ADPfITION. 69 LESSON CXIX. 1. In a school 25 girls learn to write, 20 learn arithmetic, 18 learn grammar, 15 learn geography, and 12 learn history; what number of girls are there in the school? 2. There is an orchard in which there are 75 apple-trees, 25 peach-trees, 15 pear-trees, and 12 plum-trees; what is the whole number of trees in the orchard? 3. There is a school in which there are 4 classes; in the first class there are 125 girls, in the second 120, in the third 124, and in the fourth 175. What is the whole number of girls in the school? 4. A gardener has in his nursery 525 apple-trees, 375 peach-trees, 275 cherry-trees, 250 plum-trees, 175 pear-trees, and 750 other trees of various kinds; how many trees are there in the nursery? 5. In a certain farm there are 124 acres under cultivation, 75 acres for mowing, 140 acres of pasture, and 175 acres of wood-land; what number of acres are there in the farm? 6. A man purchased a farm for which he paid 5,750 dollars; he afterwards paid 375 dollars for clearing and fencing, and 325 dollars for barns and sheds. How many dollars did the farm cost him? 7. A"mechanic owns five houses. No. I is worth 7,525 dollars; No. 2, 6,475 dollars; No. 3, 5,845 dollars; No. 4, 5,425 dollars; No. 5, 5,300 dollars. What number of dollars are the five houses worth? S. A teacher wished to know how many questions had been performed by the first class in arithmetic during the last 5 weeks; and on inquiry, he found that the class had performed 75 questions during the first week, 85 during the second week, 95 during the third, 105 during the fourth, and 125 during the fifth week. H-ow.many questions had they performed during the last five weeks? 9. Three trains of cars started fro1m Boston on the same day; the first train carried 525 passengers, the second 675, and the third 750. How many passengers were tbere in the three trains? LESSON CXX, SUBTRACTION. SuBrlBACTiloN is the method of taking a less number from a greater, to find the remaincler, or dilferenee. The less number is called the subtrakenzd, and the greater, the minuend. The number found by taling a less number from a greater is called the remainder, or difference, and it shows how many the greater number exceeds the less. Subtraction is performed, when each figure of the less number -is smaller than the corresponding figure of the greater, by taking each figure of the less number from the corresponding figure of the greater, and writing the reremainder underneath; the several remainders will express the whlole difference. Illustration. - A merchant purchased 765 yards of cloth, and has since sold 523 yards of it; what number of yards has h e h remaining unsold? We first write down the 765 No. of yards purchased. greater number; then we 523 No. of yards sold. write the less number under 242 No. of yards unsold. the greater, placing units under units, tens under tens, and hundreds under hundreds. We then take 3 tunits from 5 units, and 2 units remain, which we write directly under the units. Then 2 tens fiom 6 tens, and 4 tcos remain, which we write under the tens. Lastly, 5 hundred from 7 hundred, and 2 hundred remain, which we write under the hundreds. The whole remainder or dicfference is 242. When any figure of the less number is larger than the corresponding figure of the greater number, the following question and its illustration will show the method of performing the operation: - A man borrowed 94 dollars, and has paid 46 dollars; how many dollars remain unpaid? We cannot take 6 units from Borrowaed 94 dollars. Paicld 4 dolla. 4 units; and as 10 units of any doas. lower order are equal to 1 unit UTnpaid 48 dollars. of the next higher ordoer, we SUBTACT ION. 71 acdd 10 units to 4 units, and the sum is 14 units; and 6 units from 14 units leave 8 units. We now add I (ten) to the 4 tens, and the sumt is 5 tens, and 5 tens from 9 tens leave 4 tens; therefore 48 dollars remain unpaid. The reason of this method of performing subtraction depends upon a self-evident truth, viz., that if two unequal numbers be equally increased, their diference remains the same. From the above examples and illustrations, we derive the following RULE. - Write down the greater number; then write the less number under it, placing units under units, tens under tens, hundreds under hundreds, and draw a line underneath..Begin with the units, and subtract each figure of the less number in succession from the jigure over it, and write the remainder underneath. Whenever a figure of the less number is greater than the figure over it, add ten to the upper figure, subtract the lower figure from the amount, then add one to the next lower figure before it is subtracted, Subtraction is indicated by a short horizontal line, thus, 12- 8 = 4; which is read, 12 minus 8 equals 4. or 12 less 8 equals 4. LESSON CXXI. EXERCISES TO BE PERFORMED ON THE SLATE. (1.) (2.) (3.) (4.). 345 678 954 560 123 456 463 344 (5.) (6.) (7.) (8.) 9,876 4,325 5,015 6,305 1,234 1,416 4,144 4,117 (9.) (Ioc) (11.) (12.) 54,321 98,765 50,000 75,015 12,345 40,876 43,221 46,346 t72 SUJIBTACTION. LESSON CXXII. 1. A merchant borrowed 1,275 dollars, and has paid 750 dollars; how many dollars remain unpaid? 2. A trader purchased 2,500 yards of cloth, and has sold 1,745 yards of it; how many yards has he remaining unsold? 3. If a farm and the buildings on it be valued at 12,000 dollars, and the buildings be valued at 4,575 dollars, what is the value of the land? 4. A man purchased an estate, for which he paid 13,750 dollars, and has sold it for 15,225 dollars; what number of dollars did he gain by trading? 5. The Rocky Mountains are 12,500 feet above the level of the ocean, and the Andes are 21,440 feet; how many feet higher are the Andes than the Rocky Mountains? 6. A merchant purchased a quantity of goods for which he paid 2,750 dollars; the goods being damaged, he sold them for 395 dollars less than cost. What did he get for the goods? 7. A farmer raised 1,275 bushels of wheat, and has sold 786 bushels of it; what number of bushels has he remaining unsold? 8. A farmer sold a load of cheese for 195 dollars, and took goods in payment to the amount of 49 dollars, and the balance in money; how much money did he receive? 9. A man paid 125 dollars for a horse, and 75 dollars for a wagon; how much did the cost of the horse exceed the cost of the wagon?' 10. A tree 95 feet in height was broken off by the wind; the top part which fell was 39 feet in length. hHow high was the part which was left? 11. A merchant purchased a piece of broadcloth, for which he paid 240 dollars; but being damaged, he sold it for 185 dollars. Iow many dollars did he lose? 12. A cargo of fruit cost 1,075 dollars, but it was so much damaged by a storm that the owner sold it for 890 dollars; what number of dollars did he lose? ADDITIOIN AND SUBTI'iA'tION. 38 LESSON CXXIII. 1. A gentleman purchased a gold watcsh: O' 65 dollars, a chain for 12 dollars, and a key:fr 5 dollars; he afterwards sold the whole for 100 dollars. Did he gain or lose, and lhow lrlmc? 2. Charles had 175 marbles; to0w- l-tan-y o a;t he 1-'ft after giving 25 to William, 19 to C-eorgle 38 to Samuel, 49 to Edward, -41 to Johna, and losing' 2? 3. Purchased a farm for 2,125 dollars, paid for buildings and stock 1,250 dollars; for how' much must I sell the whole to gain 500 dollars? 4. A tracer sold from a piece of silk contaninng 45 yards, at one time 15 yards, at another time 10 yards, and at another time 12 yards; how many yards were loft in the piece? 5. " A boy bought a sled for 28 cents, and gave 14 cents to have it repaired; he sold it for 40 cents. Did he gain or lose by the bargain, and how much? " 6. A. man owing 350 dollars, paid at one time 47 dollars; at another time 84 dollars, -at another tim e 35 dollars, and a.t another' time 120 dollars; how much did he then owe? 7. A lady gave 6,000 dollars to humane institutions; viz., 1,500 dollars to the Orphan Asylum, 2,500 dollars to the Institution for the Blind, and the remainder for the education of the Deaf and Dumb. What was the sum- given to the last-named institution? S. A market-man having 575 pounds of butter, sold 125 pounds to one man, 95 pounds to another, and 45 pounds to another; how many pounds had he remaining unsold? 9. 915 + 624++ 450 + 375 - 1,125: how many? 10. 15,475 + 25,750 + 145,725 - 85,000 - how many? 11. 75,425 + 84,676 - 95,500 - 150,000 = how many? 12. 94,645 + 15,106 + 44,350 - 105,666 what number? 7 LESSON CXXIV. MULTIPLICATION. MULTrIPLICATIONl is the method of taking or repeating o-e of two given numbers as many times as there are units itl the other. Mutiplication is also a short method of perfo>ning addition, when all the numbers to be added are alike. One of tho two'given numbers is called the multiplicand l, and is the numrbler to be multiplied. The other is called the multiplier, and it is the number to multiply by, and shows the number of times the multiplicand is to be taken or repeated. The nunber produced by miltiplying one of the two given numbers by the other is called the product, and it contains either of the two given numbers as many times as there are units in the other. The multiplicnand and multiplier are called faictors of the product. The sign of multiplication is an inclined cross; thus, 8 X 5- 40, which is read, 8 multiplied by 5 is equal to 40. Illustrateon First. - Suppose we wish to find the cost of 3 yards of cloth, at 12 cents a yard. It is plain that 3 yards will cost three times as nmany cents as one yard. First Method. Second MJethod. AMultiplicand, 12 cents, the price of I yd. 12 cents. Miultiplier, 3, the number of yards. 12 cents. 12 cents. Product, 38 cents, the cost of 3 yds. The cost of 3 yards, 36 cents. We may write down 12 cents, the price of one yard, and multiply them by 3, the number of yards, as is done in the first method; or, we may write down 12 cents, the price of one yard, 3 times, and add them, as is done in tie second method: the result is the same in each of the methods. Illustration Second. - If an acre of land is worth 125 dollars, how many dollars are 9 acres worth? If one acre is worth 125 dollars, 9 acres are worth 9 MULTIPLICATION. 75 times 125 dollars: and nine times 125 dollars can be found by multiplying 125 by 9, in the following manner: Ve write down the multi-'ill 6.'~ plicand, 125; and write the M icr 125 d o-ls. multiplier, 9, under the units 3Iult;iphicand, 125 dcols.' ultip ie, of the multiplicand. We then' ____. say, 9 times 5 units are 45 Product, 1.125 dol s. units, or 4 tens and 5 units; we write down the 5 units, and reserve the 4 tens: then, 9 times 2 tens are 18 tens, and 4 tens which we reserved are 22 tens, or 2 hundred, and 2 tens; we write down the 2 tens, and reserve the 2 hundred: then, 9 times 1 hundred are 9 hundred, and 2 hundred which we reserved are 11 hundred, or 1 thousand, and 1 hundred; both of which we write down, and the whole product is 1,125, the number of dollars that 9 acres are worth. From the preceding questions and illustrations, we derive the following rule for multiplication, when the nmultiplier does not exceed 12. RULE. - Trite down the multiplicand; then write the multiplier under the multiplicand, placing units under units, tens under tens, and draw a line underneath. AMultiply each figure of the multiplicand, beginning with units, by the multiplier: when the product of any figure does not exceed nine, write it under- the figure zmultiplied; when the product exceeds nine, write down, the right-hand figure of it, and add the leftt-hand figure. or figures, to the product of the next figure, and writ.e down the whole product of the last figure. LE SSON CXXV. (1.). ) () (3.) (4.) lMultiply 432 543 654 765 by 5 6 7 8 (5.) (6.) (7.) (s.) Multiply 20,406 46,075 56,708 76,543 by 9 10 11 12 7 MULT'I3PTLICA.T:0'y. 9. What is the value of 9 acres of land, at 125 ldoHlia'nl acre? 10. Tlher-e ae,760 yards in one mile; how many yards: are ther-e in 10 miles? 11. in one year there are 3'65 days; how many days are there in II years? 12. There are 2,240 pounds in one ton; how many pounds are there in 12 tonms LESSON CXXVIo What will be the product of 7,654 mu ltiplied by 543 9 ]llustrati'on of 7,654 multiplicand. the process. 543 multiplier. 22962 = 3 times the multiplicand. 306.6 - 40 times the multiplicand. 38270 500 times the multiplicand. Product, 4,156,12 2 = 543 times the multiplicand. When the multiplier consists of several figures, we first multiply the multiplicanid by the units of the multiplier, as directed in the preceding rule. We next multiply the msul'tipicand. byt t tenos of the multiplier, and' write the first figure of lte product in the place of tens, because units muitiplied by tens prodlce tens. Then we multiPTlv the multi'pliocmd by the hundreds of the multiplier, and write the first figure of the product in the place of hundreds, because units multiplied by hundreds produce l.undreds. Finally, we add the several products, and the total product thus obtained is 4,156,122. 1 roen the preceding illustration we deduce the following:'ide for mulitipication, when. the multiplier consists of several figrees -~ t, uJLE. - Wite coWn the mdtolic te ti an d; t/he write the multipvlier under the multiplicancld, placing units under untits, tens unclder tens, and hcundreds under hundreds. Mltaiihply the inlltiplibcand b7y each, si?,gnificant,fiTgre' MULTJ PIICATION. 7 qo the multiplier, in succession, beginning with units, and write the first fiure of each product directly under the figure by which you are multi3plying. Ficnd thee zm of the several products; their sumt will be the total product required. LESSON CXXVII. 1. What will be the product, of 325 multiplied by 23? 2. Wha-t will be the product of 436 multiplied by 45? 3. What will be the product of 578 multiplied by 67? 4. What will be the product of 908 multiplied by 98? 5. What will be the product of 315 multiplied by 234? 6. What will be the product of 435 multiplied by 506? 7. What will be the product of 508 multiplied by 805? 8. What will be the product of 645 multiplied by 744? 9. What will be the product of 719 multiplied by 912? 10. What will be the product of 915 mu-ltiilied by 814? 11. If a ship sail uniformly 175 miles each dav, what number of miles will she sail in 25 days? 12. A man purchased a wood-lot, containing 45 acres, at 35 dollars an acre; what did it cost him? 13. If an acre of land produce 32 bushels of wheat, how many bushels will 64 acres produce? 14. If a bale of sheeting contain 36 pieces, and each piece measures 32 yards, what number of yards does the bale contain? 15. If an acre of land produce 225 bushels of potatoes, what number of bushels will 25 acres produce? 16. If an acre of land is worth 225 dollars, what is the value of a farm containing 175 acres? 17. A merchant imported 350 boxes of oranges. What number of oranges did he import, supposing each box to contain 180 oranges? 18. In an orchard there are 120 apple-trees. Supposing each tree to bear 10 bushels of apples, and each bushel to contain 240 apples, and each apple to contain 12 seeds, what number of seeds are there iI the whole number of apples? 7* LESSON CXXVIIT. DIVISION. D-Vx'ISI:ON is the milethod of uinding how many timles, or whatt part of a tine, one of two given numbers is containedl in the other or, it is the process of finding any required part of any given number. Division is also a short method of performling several subtractions of the same number. Oie of the two given numbers is called the diviclend, and is the nu mber to be divided. The other is called the divisor, ancd is the number to divide by, and indicates w hat part of the dividend is required. The number found by the operation is called the quotient, and it shows the number of times, or part of a. time, ~it;at the divisor is contained in the dividend. It expresses ailso: number1 of nits. or npabt of, pat nit,, in the required'iart of the c. iclenid. Thle si), ot dvlision is a short line betwTeen two points, thus, e ancd is read, Cdvilded tbi. W hen placed between two pnumltaers, it s how ihat the nlu.tmbner before it is to be divided by the nu-mbelr after it; thus, 20 - 5-= 4, which is read, 20 divided by 5 equals 4. DSivision is also denoted by writing the divisor undey itie dividend,'with a -short line between them; thus, I, w hich iy be read, 12-divided by 6, 3 divided by 4. jllustration 7i'irst. -- Suppose we ish to find how many yards of cloth can be purchased with 36 cents, at 12 cents a yard. It is plain that as many tines as 12 cents are containedi in 38 cents, so many yards can be purchased. In the first method, Ist mcethodl. we write 36, the The divisor 12) 36 the dividend. number of cents, for 3 the quotient. le dividend, and then write 12, the number of cents in the price of a yard, at the left of the dividend, for the divisor; we find that 12 is contained in 38, 3 times; hence 3 is the number of yards that can be purchased with 38 cents, at 12 cents a yard. ITYJISION. 7, 2d nethod. In the second method, we write cown 36 36 cents. cents, and subtract 12 cents from 36 cents, 12 cents. and 24 cents remain; we next subtract 12 4 cents cents from 24 cents, and 12 cents remain; 12 cents finally, we subtract 12 cents from 12 cents, and nothing remains. NWe here see that 12 12 cents. cents has been s-ubtracted ftom 36 cents 3 12 cents. times; hence 3 is the number of yards that can be purchased with 36 cents, at 12 cents a yard. We have rfus found t'hat the same number of yards can be purchased with 36 cents, by each of the methods. Illustration Second. -- How many tnmes is 9 contained in 675? We write down the dividend and draw a curve line on'each side of it, and thenl write- the divisor at the left of the dividend. We next find the number of times that the'II' 1 divisor, 9, is con-tained in 67 tens, which is ) (E-S i7 (tens) times; we write he'7 (tens) at the 9)675 (75 6 3 riright of the dividend for the first figure in the - quotient, and multiply the divisor by the 7 45 (tens); the product is 63 tens, which we 45 write'under the 67 tens: we then subtract 63 tens from 67 tens; the remainder is 4 tens. We then place the 5 units of the dividend at the right of the remainder, and we have the number 45. The divisor, 9, is contained 5 times in 45; we write the 5 units at the right of the 7 tens in the quotient, and multiply the divisor by the 5 units; the product is 45, which we write under the 45. There being no remainder, the operation is completed, and we have found that 9 is contained 75 times in 675. Jllust. 3d. -If 10,624 1ivisor. Dividentl. QLotin At dollars be equally divided 15) 10624 ( 708- 1 Ans. 1 05 among 15 men, what num_______ ber of dollars will each man 124 receive? We first write 120 down the dividend, and I- rem a r, then write the divisor at its 4 -remnajindler. left, as before. We perceive tha.t the divisor, 15, is contsained in. 106 (hund.red) 7 (hun 80 DIVISION. dred) times; we write 7 (hundred) in the quotient, and mul. tiply the divisor by it; the product is 105 hundred, which we write under 106 hundred; we then subtract; and the remainder is I hundred: we then place the 2 (tens) of the dividend at the right of the remainder, and the number is 12 tens, which being less than the divisor, we write a cipher in the place of tens in the quotient, and then place the 4 units of the dividend at the right of the 12 tens, and the nulmber is 124: we find that 15 is contained in 124,8 times; we write 8 in the quotient, and multiply the divisor by i-t; the product is 120, which we subtract from 124, and the remainder is 4. This remainder, 4, will contain 15 4 fifteenths of one time, which we write in a fractional form at the right of the quotient figures before found, and we have the complete quotient, 708 —w, which is the number of dollars that each man will receive. From the preceding questions and illustrations we derive the following gyenel cd rule for division: - IIULE. -Write down the dividend; draw a curve line on each side of it, and write the divisor at its left. ake so maniy of the highest orders of figures of the dividend as will contain the divisor; find the number of times the divisor is contained in them; write a figure expressing the n2umber at the right of the dividend, for the first figure of the quotient; then multiply the divisor by this quotient figure, and write the product under those figures of the dividend taken. Szubtract this product f'romi those figures, and place the next undivided figure of the dividend at the right of the remainder; then divide these orders of figures as before, and thus proceed until all the figures of the dividezd are divided. If there be a final remainder, write it over a short line at the right of the quotient figures already found, and place the divisor under it, which will express what part of a time the remainder contains the divisor, and completes the quotient. Whenever a figure of the dividend has been annexed to the remainder, if this partial dividend is less than the DIVISION. 81 divisor, write a cipher in the quotient, and annex another figure. LESSON CX IX. 1. How many times is 13 contained in 4,056? 2. I-low many times is 15 contained in 5,475'? 3. How many times is 16 contained in 6,804? 4. How many times is 18 contained in 9,221? 5. How many times is 21 contained in 8,757? 6. What is I thirty-fifth of 75,445? Of 150,890? 7. What number of times is 125 contained in 46,875? 8. WYhat number of times is 276 contained in 89,700? 9. What nunber of times is 365 contained in 147,825? 10. If a man's income be 5,110 dollars a year, what is that a day, allowing the year to contain 365 days? 11. There are 144 square inches in 1 square foot; how many square feet are there in 10,800 square inches? 12. In one acre there are 160 square rods; how many acres are there in 28,000 square rods? 13. A man purchased a farm containing 275 acres for 6,875 dollars; how many dollars did he pay for each acre? 14. The circumference of the earth is about 25,000 miles; if a railroad car travel at the rate of 480 miles a day, in how many days would it travel round the earth? LESSON CXXX. TWhen the divisor does not exceed 12, the operation may be shortened by performing the operation mentally, and writing only the quotient. Illustration. - If 109,025 acres of land be ecually divided among 12 men, what number of acres will each man have? 12) 109,025 The two highest orders of figAns. 9.085.- acres. ures being less than the divisor, 82 DIVIStON. we take the three highest, 109 (thousand), and find that 12 is contained in 109 (thousand) 9 (thoursand) times; we write the 9 under the order of thousands in the dividend, and, mentally, multiply the divisor by it; the product is 108 (thousand), which we subtract from 109 (thousand); the remainder is 1 (thousand); this remainder and next figure of the dividend, 10 (hundred), being less than the divisor, we write a cipher in the place of hundreds in the quotient: we then find that the divisor is contained in the remainder andc two next figures of the dividend, 102 (tens), 8 times; we write 8 in the quotient, in the place of tens, and multiply the divisor by it; the product is 96 (tens), which we subtract from 102 (tens); the remainder is 6 (tens): we then find that the divisor is contained in this remainder and last figure of the dividend, 65, 5 times; we write 5 in the quotient, in the place of units; we then multiply the divisor by it, and the product is 60, which we subtract from 65; the remainder is 5: this remainder will contain the divisor 5 twelfths of 1 time, which we place at the right of the quotient figures before found, and the complete quotient is 9,085-2-, the number of acres which each man will have. 1. Divide each of the following numbers by 2 and 4. 446; 682; 506; 874; 916; 1,276; 2,548. 2. Divide each of the following numbers by 4 and 6. 448; 816; 564; 728; 824; 936; 1,272. 3. Divide each of the following numbers by 6 and 8. 324; 648; 786; 672; 846; 936; 1,236. 4. Divide each of the following numbers by 8 and 9 848; 728; 928; 1,688; 1,806; 1,248; 1,848. 5. Divide each of the following numbers by 9 and 10. 819; 729; 1,242; 1,539; 1,863; 2,745. 6. Divide each of the following numbers by 10 and I1. 540; 624; 850; 1,260; 1,580; 2,460. 7. Divide each of the following numbers by 11 and 12. 372; 612; 720; 840; 1,80.0; 1,728. 8. If 1,296 dollars be equally divided among 9 men, what number of dollars will each man receive? 9. If 12 bales.of cotton, each of the same size, weigh 6,912 pounds, what is the weight of each bale? FR AC TI 0N S. INTRODUCTORY LESSON. Dejin'itions and Illustrations. WHEN any whole thing or number is divided into any number of equalparts, the parts are called fractions of the thing or number. If an orange be divided into two equal parts, the parts are called halves. If it be divided into three equal parts, the parts are called thirds. If it be divided into four equal parts, the parts are called fourths. If it be divided into five equal parts, the parts are called fifths. If it be divided into six equal parts, the parts are called sixths. If it be divided into seven equal parts, the parts are called sevenths. If it be divided into eight equal parts, the parts are called eighths. If it be divided into nine equal parts, the parts are called ninths. If it be divided into ten equal parts, the parts are called tenths. If it be divided into eleven equal parts, the parts are called elevenths. If it be divided into twelve equal parts, the parts are called. twelfths. The number of equal parts into which any whole thing or number is divided always indicates the name of the parts. Fractions are usually expressed by two numbers written one above the other, with a short line between them; t.us. I one 2 two S3 three 4 frl 5 five ( six 7 eevei. -lhalf, 3 thirds, fourths, 5 filths, sixths, 7 sevenths, 8 eightl 9 nine 10 ten 1 eleven ninths, TO tenths, TTelevenths, T twelfths. The number below the line expresses the number of equal parts into which the whole thing or number is supposed to be divided; and it is called the denominator, because it indicates the name of the parts, as. thirds, Jourths, fifths, &c. The number above the line is called the numerator, because it shows the number of equal parts expressed by the fraction.. 84 MULTIPLICATION AND DIVISION OF FBRACTIONS. LESSON I. 1. In a unit, or 1, there'ae 2 halves. How many halves are there in 2? In 21- In 4? In 41 In 6..:In In6?- In 8 In 8 n 10? In 10?I T'le 2 Ialtves of cany whole ting or unit are equal to the whole thing or unit; hence, in any number of halves, there must be 1 half as many whole ones or units as there are halves. 2. Hlow many whole ones are there in 4 halves? In 5 halves'e In 8 halves?-!I1n 9 halves? In 12 halves? In 13 halves? In 16 halves? In 17 halves? In 20 halves - In 21 halves?, In 24 halves? 3. In a unit, or 1, there are 3 thirds. Iow many thirds are there in 2? In 21? In 4? In 4? In 6? 6 ~ - i~,; Since the 3 thirds of any whole th'ing or unit are equal to the vwhole thing or unit, there must be 1 third as many whole ones or units as there are thirds. 4. HI-ow many whole ones are there in 6 thirds? In 7 thirds? I I12 thirds? In 14 thirds? In 18 thirds? In 19 thirds? In 24 thirds?: 5. in- a unit, or 1, there are 4 fourths. -How manvy fortcths arte t in 3? In 5 n? In 9-? Since 4 /fourtlts are ctqual to a whole one, there must bIe 1 fon.th as many -whole ones as there e afourths. 6. How many whole ones in 12 fourths? In 21 fourths? In 28 fourthis? In 38 fourths? 7. In a unit, or., thre are 5 fifths. How many fifths are there in 2 In 3:? In 4? In 5? In 6? ASince 5 qffths are equal to a whole one, there must be I fifth as mnany whole ones as there are fifths. 8. I1-ow many whole'ones are there in 10 fifths? In 16 fit In 20 f iths?i: In 02 f ifths? hs In 30 fifths? 9. In a unit, or 1, there are 6 sixths. How many sixths are there in 3 In 4-9.In 5?: In 6-1?'In 7? Since 6 sixths are equal to a whole one, there must be sifxth as many whole ones as there are sixths. 10. How many whole ones are there in 18 sixths? In 25'sixAh? In 30 si s? In 38 sixths? In 42 sixths?':x:.Gs In 0 rx.t]~s, MULTIPLICATION AND DIVISION Of' I'FRCTIONS. 85 LESSON II. 1. In a unit, or 1, there are 7 sevenths. How imany sevenths are there in 4 In 5-. In 6? In 7-? In 8?. I.n9-? Inl0. In 2? Since 7 sevenths are equal to a whole one, there must be 1 seventh as many whole ones as there are sevenths. 2. How many whole ones are there in 28 sevenths? In 36 sevenths? In 42 sevenths?- In 51 sevenths? In 56 sevenths? In 66 sevenths? In 84 sevenths? 3. In a unit, or 1, there are 8 eighths? How many eighths are there in 5? In 6-'? In 7? In 8? In99. In 10-1? i1 ll? In 12? Since 8 eighths are equal to a whole one, there must be 1 eighth as many whole ones as there are eighths. 4. How many whole ones are there in 40 eighths? In 51 eighths? In 56 eighths? In 69 eightihs? In 72 eighths? In 86 eighths? In 88 eighths? In 96 eighths? 5. In a unit, or 1, there are 9 ninths. How many ninths are there in 6? In 7? In? I n 9? In n 10? In 1O- In? nl? n 12? Since 9 ninths are equal to a whole one, there must be I ninth as many whole ones as there are ninths. 6. How many whole ones are there in 54 ninths? In 64 ninths?.'In 72 ninths? In 84 ninths?: In 90 ninths? In 95 ninths? 1n 99 ninths? In 108 ninths? 7. In a unit, or 1, there are 10 tenths. How many tenths are there in 5? In?a 6- n? 8?In 9 —? In 10? In 11%? iln 2? Since 10 tenths are equal to a whole one, there must be 1 tenth as many whole ones as there are tenths. 8. I-low many whole ones are there in 50 tenths? In 63 tenths? In 80 tenths? In 96 tentlhs? In 100 tenths? In 119 tenths? In 120 tenths? H 86 MULTIPLICATION AND DIVISION OF FRACTIONS. LESSON III. 1. If 1 hclf of a yard of cloth cost 5 cents, what will 2 halves, or a whole yard, cost? 2. If I third of a yard of cloth cost 4 cents, what will 2 thirds of a yard cost,? What will 3 thirds, or a whole yard, cost? 3. If 1 fourth of a gallon of milk is worth 5 cents, what are 2 fourths of a gallon worth?- 3 fourths? What is a gallon worth? 4. If 1 fifth of a bushel of apples is worth 10 cents, what are 2 fifths of a bushel worth? 3 fifths? 4 fifths? What is a bushel worth? 5. If 1 sixth of a bushel of wheat is worth 12 cents, what are 2 sixths of a bushel worth? 3 sixths? 4 sixths? 5 sixths? What is a bushel worth? 6. If 1 seventh of a yard of silk cost 10 cents, what will 2 sevenths of a yard cost? 3 sevenths? 4 sevenths? 5 sevenths? 6 sevenths? What will a yard cost? 7. If 1 eighth of a pound of tea cost 7 cents, what will 2 eighths of a pound cost? 3 eighths 4 eighths? 5 eighths? 6 eighths? 7 eighths? What will a pound cost? 8. If 1 nzint of an acre of land is worth 12 dollars, whatt a e 2 ninths of an acre worth? 3 ninths? 4 ninths' 5 ninths? 6 ninths? 7 ninths? 8 ninths? W.hat is an acre worth? 9. If 1 tenth of a bushel of apples cost 10 cents, what, will 2 tenths of a bushel cost? 3 tenths? 4 tenths? 5 tenths? 6 tenths? 7 tenths? 8 tenths? 9 tenths? What will a bushel cost? 10. If 1 twelfth of a pound of gold dust is worth 16 dollars, what are 2 twelfthls of a pound worth? 3 twelfths? 4 twelfthii? 5 twelfths? 6 twelfths? 7 twelfths? 8 twelths 0 9 twelfthsl? 10 twelfths? 11 twelfths?'What is a pound worth? 11. If a yard of silk is worth 80 cents, what are 1a yards worth? What are 121- yards worth? .MU:LTIPlICATION AlND DIVISION OF FI.ACTIONS. 87 LESSON IV. 1. When corn is worth 3 fourths of a dollar a bushel, how many dollars will 8 bushels cost? How many dollars will 12 bushels cost? 2 If a boy can earn 3 fifths of a dollar in a day, how many dollars can he earn in 5 dasiY -ow many dollars can he earn in 10 days? 3. A man worked 10 days for 6 fifths of a dollar a day; how many dollars did he earn in the 10 days? 4. William paid 3 eighths of a dollar for a pair of gloves, and 8 times as much for a hat; how many dollars did he pay for his hat? 5. A lady paid 7 eighths of a dollar for a pair of shoes, and 8 times as much for a bonnet; how many dollars did she pay for her bonnet? 6. A man paid 5 eighths of a dollar for a bushel of corn; how many dollars must he pay for 8 bushels? 7. Mary is 10 years old, and her age is just 2 thirds the age of Susan; how old is Susan? 8. A boy paid 10 cents for 5 sixths of a pound of raisins; what would a pound cost, at the same rate? 9. A trader purchased a quantity of oats and corn; he paid 35 cents per bushel for the oats, which was 7 tenths as much as he paid per bushel for the corn. What was the price of the corn per bushel? 10. A farmer paid 27 dollars for a cow, which was 3 eighths of what he paid for a horse; how many dollars did he pay for his horse? 11. A trader sold a gold watch for 96 dollars, which was 8 sevenths of what the watch cost him; what was the cost of the watch? 12. Mary is 12 years old, and 5 sixths of Mary's age is 2 thirds of Caroline's age; how old is Caroline? 13. A piece of cloth containing 12 yards was sold for 60 dollars, which was 5 fourths of what it cost; what did it cost?: What was the gain on each yard? 14. A man sold a horse for 63 dollars, which was 7 eighths of what the horse cost him; what was the cost of the horse? How much did ho ]os? 88 ADDITION AND SUBTR ACTION OF.FR-ACTIONS. LESSON V. Fracttions (or fractional parts of the samet thing o? number) having the same name or denominator are added and subtracted in the same manner as whole nucmbers are added and subtracted. 1. 1 half and 2 halves and 3 halves and 4 halves, less 6 halves, are how many halves? How many whole ones? 2. 2 thirds and 4 thirds and 5 thirds and 7 thirds, less 6 thirds, are how many thirds? How many whole ones? 3. 3 fourths and 5 fourths and 6 fourths and 10 fourths, less 8 fourths, are how many fourths? How many whole ones? 4. 2 fifths and 3 fifths and 4 fifths and 6 fifths, less 10 fifths, are how many fifths? How many whole ones 9? 5. 8 sixths and 7 sixths and 5 sixths and 4 sixths, less 1 2 sixths, are how many sixths? I-ow many whole ones? 6. 3 sevenths and 4 sevenths and 5 sevenths and 9 sevenths, less 7 sevenths, are how many sevenths? How many whole ones? 7. 10 eighths and 9 eighths and 7 eighths and 4 eighths, less 6 eighths, are how many eighths?' How many whole ones? 8. 4 ninth-s and 5 ininths and 6 ninths and 7 ninths and 8 ninlh1s, less 3 ninths, are how many ninths? Ilow many whole ones? 9. 9 tenills anc 8 tenths and 7 tenths and 6 tenths and 5 teenths and 3 tenth s, lss 8 ten as, are how mainy tenths? -:-How many whole ones? 10. 4 elevenths and 5 elevenths and 6 elevenths and 10 elevenths, less 3 elevenths, are how many elevenths? Hlow many whole ones? 11. 10 twelfths and 9 twelttlhs and 8 twelfths and 7 twelftihs and. 6 twelfths, less 4 twelfths, are hrow imany t welft:hs.? How many whole ones? ADDITION AND SUBTRACTION OF TERACTIONS. 89 LESSON VI. When fractions having dfferent names or denominators are to be added or subtracted, they must first be changed to fractions having the same name or denominator. -This may be done by multiplying the numerator and denomninator of one or both of the given fractions by such number as will produce the same number for a denominator of each fraction. 1. What is the sum of - and ~? What the difference? = -, and i and c =, their sum. - less -=, their difference. 2. What is the sum of 2 and I? What the difference? i = g and I _ = - A - 1 7 - 15, their sum. -9 ~- - =', their difference. 3. What is the sum of I and 2? What the difference? 4. What is the sum of a and -? What the difference? 5. What is the sum of ~ and -? What the difference? 8. What is the sum of I and I? What the difference? 9. What is the sum of - and -? What the difference? 9. What is the sum of 3 and-? What the difference? 10. What is the sum of 2 and 5? What the difference? 11. Harriet purchased X of a yard of cloth at one store, and 2 of a yard at another. How many fourths of a yard did she purchase? how many yards? 12. Augusta paid I of all her money for a shawl, and i of it for a bonnet; what part of her money had she remainino? 13. Henry purchased a pine-apple, and gave ~ of it to his sister, and ~ of it to his brother; what part of it had he left? 14. A man having undertaken to perform a job of work, did 1 of it the first day, ~ of it the second day, and the remainder of it the third day; what part of it did he do the third day? 15. A market-woman sold 5 of all her apples to one man, and i of them to another; what part of them had she remaining unsold? _.. 90 TABLES OF MONEY, WEIGH{T, AND iEASUR.J. F DERAL i MONEY Federal money is the national currency of the United States. The denominations of Federal money are, the eagle, E.; the dollar, $,; the dime, d..; the cent, c.; and the mill, m. The gold coins are, the eagle, the double-eagle, the half-eagle, the quarter-eagle, and the dollar. The silver coins are, the dollar, the half-dollar, the quarter-dollar, the dime, the half-dime, acnd the three-cent piece. The copper coins are, the cent and the half-cent. 1 eagle = 10 dollars. $. 1 dollar i= T of 1 eagle. 1 dollar = 10 dimes. d. 1 dime =- - of 1 dollar. I dime 10 cents. c. 1 cent = - of I dime. I cent = 10 mills. m. 1 mill =-1- of I cent. The following table exhibits the value of the fractional parts of one dollar, expressed in cents, which are in common l ue.,o of a dollar = 5 cts. I of a dollar = 25 cts. I of a dollar = 6' cts. I- of a dollar = 331 cts. - of a dollar = 81 cts. - of a dollar -= 37 cts. T1 of a dollar - 10 cts. I of a dollar 5= 0 cts. 8 of a dollar = 121 Cts. g of a dollar 621 cts. *- of a dollar - 163 cts. of a dollar - 75 cts. I f a dollar 20 et. 7 of a dollar 8= 8 c7 ta. In New York, and some other states, the denomlinations of money in common use are dollars, shillings, and pence; the dollar being equal to 8 shillings or 100 cents, the shilling 121 cents, and the penny 1 cent. 1 shilling, or -L of a dollar, = 121 cents. 2 shillings, or ~ of a dollar, = 25 cents. 3 shillings, or - of a dollar, = 371 cents. 4 shillings, or I of a dollar, 50 cents. 5 shillings, or A of a dollar, = 621 cents. 6 shillings, or I of a dollar, = 75 cents. 7 shillings, or - of a dollar, - 871 cents. 8 shillings, or 1 dollar, = 100 cents. TABLES OF MtONEY, WETO.UT, AND MEABUREi 91 EN GLIS S f MOE ll The denominations of Eng'lish nioney are, the pound, t.; the shilling, s.; tthe penny, d.; and the farthing, qr. L poind = 20 shillings. I shilling =- -, of I ~. I shilling = 12 pence. I penny -= L of 1 s. 1 penny = 4 farthings. I farthing = 1 of 1 d. T S 0 T WEIGHT. Troy weight is ulsed in weighing gold, silver, platina, dianmonds, and other precious stones. The denominations of troy weight are, the pound, lb.; the ounce, oz.; the pennyweight, pwt.; and the grain, gr. The standard troy pound of the United States is the weight of 22.794377 cubic inches of distilled water weighed in air. 1 pound 12 ounces. 1 ounce - = - of I lb. I ounce = 20 pwts. 1 pwt. -= - of 1 oz. I pwt. = 24 grains. 1 grain =- 14 of 1 pwt. AV OIR BU P VE s I IG T a &voirdupois weight is used in weighing most kinds of merchandise, and all metals except silver ancl gold. Its denominations are, the ton, t.; the hundred-weight, cwt.; tle quarter, qr.; the pound, lb.; the ounce, oz.; and the dram, dr. I ton = 20 hund. wt. I cwt. = — of 1 ton. 1 hund. wt. = 4 quarters. 1 qr. = $ of I cwt. 1 quarter - 28 pounds. 1 lb. = of I qr. 1 pound -= 16 ounces. I oz. = — of llb. 1 ounce =- 16 drams. 1 dr. = TU of 1 oz. 92 TABLES OF' MONILY, WVlGiGHT, ANiD IEASUREo APOTHIECARIES' rEIGUHT. This weight is used only by apothecaries and physicians in compounding medicines. Its denominations are, the pound, lb.; the ounce, t; the dram, 3; the scruple, ); and the grain, gr. I pound = 12 ounces. I ounce 2= - of 1 lb. 1 ounce = 8 drams. 1 dram = -s of I ~. 1 dram = 3 scruples. I scruple- ~ of 1 5. I scruple 20 grains. I grain _= ~ of 1 3. LINEiAR MEASURE. This measure is used in measuring distances, lengths, breadths, heights, and depths. Its denominations are, the degree, deg.; the league, lea.; the mile, m.; the furlong, fur.; the rod, rd.; the yard, yd.; the foot, ft..; and the inch, in. 1 degree = 60 G. miles. 1 G. mile = of 1 deg. 1 degree 69j S. miles. 1 S. mile -= Ty of 1 deg. I league = 3 miles. I mile - of 1 lea. I mile = 8 furlongs. 1 furlong = r of 1 m. I furlong 40 rods. I rod — = of 1 fur. 1 rod -- 5 yards. 1 yard * _ Tr of 1 rd. 1 rod = 16t feet. 1 foot = of I rd. I yard - 3 feet. 1 foot = ~ of 1 yd. 1 foot = 12 inches. 1 inch -= Lk of 1 ft. MISCELLANEOUS MEASURES. 12 single things I dozen. 24 s. of paper I1 quire. 12 dozen -I gross. 20 quires = ream. 12 gross =1 great gr. 2 reams = 1 bundle. 144 dozen == 1 greatgr. 20 single things =1 score. TABLI3E OF M.ONEY, IWEIHIT, AND M1iEAS1URE. 93 SUPERFICIAL OEo SQUARE IU EA SUiS'REo Superficial or scquare measure is used in measuring all kinds of surfaces, such as land, paving, flooring, plastering, and everything which has length and breadth. Its denominattions are, the mile, m.; the acre, a.; the rood, r.; tihe rod, rdl.; the yard, ydl.; the foot, ft.; and the inch, in. Gunter's chain, used by surveyors in measuring land, also in measuring distances, is 4 rods, or 66 feet, in length, and is composeC of 100 links. 1 sq. mile == 640 sq. acres. 1 sq. a. -, 4 of 1 sq. me I sq. acre -4 sq. roods. 1 s. of sq. a. I sq. acre 160 sq. rods. 1 sq. rd. - i-0 of I sq. a. sq. rood 40 q rds. 1 sq. rd. - 4o- of 1 sq. r. I sq. rod - 30 sq. yards. 1 sq. yd. o- I of 1 sq. rd. 1 sq. rodC 272 sq. fee t. 1 s. ft.of 1 sq. rd. I sq. yard= 9 sq. feet. 1 sq. ft. = of 1 sq. yd. 1 sq. foot = 144 sq. inches. 1 sq. in. 1= of I sq. ft. CUBIC rEv.EASU E. Cubic measure is used in measuring solids and capacities, or anything that has three dimensions, length, breadth, and thickness. Its denominations are, the cord, c.; the ton, t.; the yard, yd.; the foot, ft.; and. the inch, in. I cord'of wood - 128 c.f f I oot - -= f T of 1 c. of wood. I foot of wood 16 e. ft. I cubic foot = - of I ft. of wood. I ton of timber = 40 c. ft. I cubic foot -= - - of I ton of timber. I cubic yarrd - 27 c. ft. 1 cubic foot = -r of I c. yard. c eubic foot = 1728 c. in. I cubic inch =- Ti- of 1 c. foot. 94A TABLES OF BMONEY, WEIGHT, AND MEA1SUURE. CLOTH iMEA S UIE. This measure is used for measuring cloth, and other goods which are sold by the yard or ell. Its denominaitions are, the English ell, E. ell; the French ell, Fr. ell; the Flemish ell, Fl. ell; the yard, yd.; the quarter, qr.; and the nail, na. I English ell =- 5 quarters. I cr. - of 1 E. ell. I French ell 6 quarters. I qr. -= -- of 1 Fr. ell. 1 Flemish ell = 3 quarters. 1 qr. = of 1 Fl. ell. I yard - 4 quarters. 1 qr. = of 1 yard. I qu.rter == 4 nails. I nail =. of 1 quarter. DSRY MEASURE. This measure is used in measuring grain, fruit, seeds, roots, salt, sand, oysters, coal, &e. Its denominations are, the chaldron, ch.; the bushel, bu.; the peek, pk.; the quart, qt.; and the pint, pt. 1 clhaldron = 36 bushels. I bushel = —, of 1 ch. 1 bushel c= 4pecks. I peck = of bu. 1 peck == 8 quarts. 1 quart =- of l pko I quart 2 pints. 1 pint = ~ of qt. AiLE AID EIEEER MEASURE. This measure is used in measuring porter, ale, beer, milk, and water. Its denominations are, the hogshead, hhd.; the barrel, bbl.; the gallon, gal.; the quart, qt. and the pint, pt. The beer gallon measures 282 cubic inches. I hogshead - 54 gallons. 1 gallon =; of 1 hhd. 1 barrel = 36 gallons. 1 gallon = g of bbl. 1 gallon = 4 quarts. 1 quart = * ofl gal. 1 quat = 2 pints. 1 pint = g of 1 qt 'ABLES OF M'IONEY, WEIGUIT, AND MEASURE. 95 WINEr MEASURE. WNine measure is used in measuring wine, and all spirituous liquors, except porter, ale, and beer. Its denominations are, the tun, t.; the pipe, p.; the hogshead, hhd.; the barrel, bbl.; the gallon, gal.; the quart-. qt.; the pint, pt; and the gill, gl. The standard gallon of the United States is the wine gallon, which measures 231 cubic inches, and contains 8.3388822 pounds avoirdupois of distilled water. The British standard imperial gallon measures 277.274 cubic inches, and contains 10 pounds avoirdupois of distilled water. I tun = 2 pipes. I pipe - of 1 tun. 1 pipe 2 hogsheads. I hhd. = - of 1 pipe. 1 hogshead = 63 gallons. 1 gallon = of 1 Ihhd. 1 barrel = 311 gallons. 1 gallon =' of I bbl. 1 gallon -- 4 quarts. 1 quart -= of 1 gal. 1 quart = 2 pints. 1 pint == _ of 1 qt. I pint-, = 4 gills. 1 gill - 4 of I pt. iES ASURE OF TIM E, Time is the measure of duration or existence. Its denominations are, the century, c.; the year, yr.; the month, mo.; the week, wk.; the day, d.; the hour, h.; the minute, m.; and the second, s. 1 century 100 years. 1 yea'r =- - T of I c. 1 year = 12 cal. mo. l c. mo. = of 1 yr. I year - 1.3y- w. mo. 1 w. mo. ---- r of 1 yr. o-~TAIY W MO- 14 1 year a-. 3654 days. 1 day -= T-1 of I yr. 1 month = 4 weeks. I week:= of 1 io. 4 1 week =7 days. I day -= of I wk 1 day = 24 hours. I hour -- of Id. 1 hour -= 60 minutes. I minute O of lh. 1 minute = 60 seconds. 1 second = J - of 1 m. 06 T'ABLES Ob MION- Y, WEIGHlFT, iND MEAStS URE. The year is divided into 12 calendar months, as follows: January, 1st mo., has 31 days. July, 7th mo., has 31 days. February, 2d " "28 " August, 8th " "C 31 March, 3d " " 31 "' September, 9th " " 30 April, 4th "30" October, 10th" " 31 " May, 5th " " 31 " November, 11th" " 30 " June, 6th " " 30 " December, 12th " 31 ~ When any year can be divided by 4 without a remainder, it is called leap year, in which February has 29 days. Circular measure is used in measuring circles, latitude and longitude, and in computing the revolution of the earth and other planets round the sun. Its denominations are, the circle, c.; the sign, s.; the degree, 0; the minute,'; and the second," 1 circle - 12 signs. 1 sign = - of I c. I circle = 360 degrees. I degree — = - of 1 c. I sign = 30 degrees. I degree = — of 1 s. 1 degree = 60 minutes. I minute -= - of I deg. 1 minute = 60 seconds. 1 second =: -1 of 1 m.n B O OKS. A sheet folded in two leaves is called a folio. A sheet folded in four leaves is called a quarto, 4to. A sheet folded in eight leaves is called an octavo, or 8vo. A sheet folded in twelve leaves is called a duodecimo, or 12mo. A sheet folded in eighteen leaves is called an 18mo. A sheet folded in 24 leaves is called a 24mo.