M«fflrfe4 - THE GIFT OF M&b&G. ^ijijaa.. olin.anx 3 1924 031 296 910 Cornell University Library The original of this book is in the Cornell University Library. There are no known copyright restrictions in the United States on the use of the text. http://www.archive.org/details/cu31924031296910 Quincy Course —IN— Arithmetic. BY COL. FRANCIS W. JARKER, Cook Co. (III.) Normal School. CHICAGO: A. FLANAGAN, Pubi,ish«r. A -4 5*f £ T T> * * *> * *> ^us arranged, awakens the thought expressed by the sentence, "Three and two are five." The very important law is, teach clear ideas first, then their signs ; teach relations of ideas and then the sentences which express them. We can express that only which is clear in the mind ; it is danger- ous to force expression of that which is dim ; lead to clearness before any attempt at expression is demanded. Ideas grow, very slowly, and the most important part of a teacher's duty, after presenting the proper opportunities for the growth of ideas, is to wait and watch. Pupils should be allowed to express their thoughts in the idioms which they have been using all their lives. The early introduction of terms, phrases, and sentences entirely foreign to their minds, such as — "divided by," "multiply," "subtract," "taking one number from another," " taking one number so many times," is disastrous ; for such forms "cannot, for a time, contain a child's thoughts. The child should be slowly led to these expressions by permitting it at first to use its own words and slowly make the new forms known by associa- tion and repetition. The teaching of each number, definition, principle, rule, process, or problem, is a language, as well as an object lesson ; in other words, 'aach number, 'definition, etc., presents an opportunity to teach lan- guage. The learning of sentences before the thoughts they express are known robs the child of power to express thought. Great free- dom of expression should be allowed, stiff formulas avoided, and the same thought expressed in as many different ways as possible, always, however, leading up to the best possible form of expression. 6. Most children know very little of number when they enter school. So far as the writer has investigated this important matter, a large majority of little ones of five years know less than three. The words they learn in reading are signs of ideas made clear by the incessant sense-activity of five years. They can be readily associated with written words ; but fhe^ase is entirely different with ideas of num- ber not yet acquired, and that must be learned by the exceedingly slow process of observation. The great,evil of learning the signs with- out the ideas must be avoided, or the result will be ruinous. To learn the ideas and two sets of signs, oral and written, at the same time, seems to be also unscientific, for the multiplicity of dead forms, in- stead of the ideas of number which make the forms a necessity and give them life, will absorb the child's attention. Following nature's order, oral signs (words) are thoroughly learned first ; therefore it is thought best in this course to teach the ideas of number and associ- ate the oral signs alone with them, during the first year. Then, too, when the ideas and their oral signs are firmly fixed in the mind they will give zest and impulse to the teaching of the new (written) forms of expression. Besides, teaching the figures furnishes a capital means of thoroughly reviewing the former work. 7. Cultivation of the power to reason, and the forma- tion of the habit of accurate and rapid calculation, are the two great motives in teaching arithmetic. The first and greater aim is reached by leading to distinct ideas of numbers and their relations ; the second by slow, graduated exercises in combination and separation of numbers, adapting each step to the easy grasp of the pupil, and never taking an advance step until all previous ones are mastered ; and, above all, never permitting, if pos- 1 sidle, a pup'ii to make a mistake. 8. The first steps in number should be taken with great care. After the child has been made thoroughly at home in the school-room, the teacher should ascertain by careful and, repeated tests just what it knows of numbers. -This examination should be made under the most favorable circumstances, and extend over a period of not less than two we"eks. " Bring me so many blocks." The teacher holds up each time the number. "Show me so many.'' "Touch so many." "Make so many marks upon the blackboard." " Take some blocks in your hand." " How many have you ? " This question is the first request for a sign of number. Then may follow the directions, "bring," "show," "touch," "make," three blocks, three marks, etc. "How many hands have you ? arms ? legs ? feet ? noses ? eyes ? ears ? mouths ? chins ? " " How many have I in my hand ? " " Now liow many ? " " Clap your hands three times." " Stamp three times. " Open your mouth three times." " Shut your eyes three times." These questions indicate something of the way a child's knowledge of number should be tested. The exercises for a time should not be continued more than three minutes. 9. When a child's knowledge of number is ascertained, begin to build there. Lose no time in trying to teach children what they already know, and never take an advance step until the preceding ones are thoroughly mastered. 10. A great variety of objects should be used in teach- ing number. For the use of one kind of objects alone leads children to associate their ideas of number with them, while clear ideas are more easily taken (abstracted) from a great many different kinds of objects. Besides, changing from one class of objects to another sus- tains the interest. It is plainly evident, too, that seeing and handling many classes of objects trains the observing powers to make distinc- tions and to classify things. See S. 1, Course of Study. 11. Until ten is taught, pupils should handle the objects themselves. Two senses are thus trained, — sight and touch. The plan of causing children to do everything for themselves is thus put in practice. " Take two blocks in one hand and three in the other." " Put them together." '■ How many have you." '' Two blocks and three blocks are • ? " " Make three marks, a dot, now make two more marks." "How many marks have you made?" "Five less two are how many ?" Let pupils in answering this question take five objects and separate them into two parts, one of which is two. For tests and reviews *the teacher should handle the blocks, — alone, suggesting the questions by different movements with the blocks, thus, — Mill. "I see five marks" (or five marks simply), III, II. "In five marks I see three marks and two marks." "Five marks less two marks are three marks." Erase the dot, 1 1 1 1 1. "Three marks and two marks are five marks." Show II, II, thus, then put them together, llll. "Two ma,rks and two marks are four marks." " Say it another way." Ans. — Two twos are four. Marks on the blackboard should be made large and distinct, gener- ally with colored crayon. 12. The teacher should thoroughly learn to make all the combinations indicated by table (see page 11), and in the order there laid down. Three ways of giving a lesson are suggested. 1st. Pupils standing around a long table plentifully supplied with objects. Let each pupil have a definite number of objects, — selected by the pupils themselves. (It may be well at times for one or two pupils- to arrange the blocks for a lesson.) The teacher at the head of the table rapidly and skilfully directs the movements of the class. 2nd. Class at blackboard, —directed by the teacher, — at blackboard on the opposite side of the room. The ways of using the blackboard in number are innumerable. 3rd. Class in their seats with objects on the desks before them. The lessons must be short, never exceeding ten minutes during the first year. 13. The written signs of number are to be learned the second year. The process of teaching figures is precisely the same as. in teaching written words. Show a number of objects, and then write (on blackboard) the sign. Write the sign and ask pupils to show that number of objects. Show a number of objects, — and have pupils write the sign. Class at the board. Show numbers of objects one after the other, and have pupils write the signs. Show III, II, thus, then change, Mill. "Write that." "Three and two are five." Teacher erases and and writes +, are and writes =. '■ Now read it the same way as before." Show objects as in oral teaching and have pupils write the answers. 7 — 4 = 3. " Erase answers." 7 — 4 = 6 + 2 = 8, 6 + 2 = 9-^-3 = 3. 9-^3 = 3 3's = 9. 3 3's = 3X3 = 9. 3X3 = "Write answers rapidly." "Erase answers again." "Read col- umns." " Erase second line.'' 7 — = 3. " Fill up the columns." 6 + = 8. " Erase again." 9 S- = 3. " Read." 3 's =9. " Erase first line. 3X =9. Use 4n these exercises all the forms of stating processes to be found in arithmetical calculation, the pupils learning them by seeing the relations which they express. In division, for example, 6 -=-2 = 3, 216 4 2)6(3, ; - ; in multiplication 2 4's = 8, 2 X =8, 2. when these 3 8 forms are firmly fixed in the mind, give the same exercises without using objects. From 10 proceed, number by number, to the develop- ment of 20, using both oral and written work. For reviews give an exercise like this orally. Have pupils write out answers upon slates or board, in columns, without hesitation. 9 + 3 ; 6 + 4 ; 3's in 12 ; 12 — 6 ; \ of 8 ; 7X2. Let pupils change slates and correct, 8 the teacher reading the answers. All means of training children to read numbers at sight — i.e., add, subtract — should be used. Avoid forming the habit of hesitating. 14. Reasoning is seeing the relation of things. A prob- lem represents things as being in certain relations to each other ; the solution of the problem depends primarily upon the mind's compre- hension of the things represented and their relations. In other words, the mind must grasp the exact conditions stated in the problem, as the first step to its solution. 15. The habit of trying to perform the problems with the figures alone, without attempting to understand the conditions, is fatal to all progress and completely barren of good results. The proper use of objects is the first step in forming this all-im- portant habit of thinking (seeing relations of things), but at every step during the whole course, when pupils cannot mentally picture out the things represented, recourse should be had to objects. See S. 14. 16. Pupils should be trained to illustrate every prob- lem WHEN POSSIBLE BY DRAWING AND OBJECTS. It is better tO perform one problem understandingly than a hundred that are only partially, understood. Quality, not quantity. See S. 17. Explana- tions by the teacher are entirely unnecessary, if the proper occasions are presented for the mind to act. It is a good plan to write a problem upon the blackboard, have a pupil read it, then, with the close attention of the entire class, ascer- tain, by sharp questioning, if they, understand it. Follow this by asking a pupil (generally the dullest) to take the first step in per- forming the problem; ask another, and another, to take the first step ; when satisfactory, have the work written upon the board, and then take the next step in the same way, and so on to the end. It is also a good plan to cause the work of a problem to be written out upon the board before any calculation is made, thus : — " How many apples at 2 cts. apiece can you buy for 8 oranges at 4. cts. apiece ? " 8x4 cts. Work written : 2 cts. 17. See 12, a. Each definition, rule, process and principle, AS IT OCCURS IN TEACHING, PRESENTS AN EXCELLENT OPPORTUNITY for an object and language lesson. A definition is a descrip- tion of a thing, or things in their relations, that can be seen. A rule is a description of a piocess that can be placed before the pupil's eyes J a principle can be discovered in a process. When the pt6ptt time comes (beginning of the fifth year in the course) this interesting series of object and language lessons should begin and be kept up through the entire course. Subjects for Object and Language Lessons. DEFINITIONS. RULES FOR A Number. Addition. Addition. Multiplication. Multiplication, Subtraction. Subtraction. Division. Divison. Notation. Principles of Notation. Numeration. Fractions. These are a few of the subjects that should be used to test a pupil's power of seeing and describing things and processes. Lesson upon the Definition of a Number. Hold up a number of objects, another and another of different objects. "What is this?" "What are these?" "It is a lot of blocks." "Five shells." "A number of things." "Is this a number?" "Yes." If this is a number, what is a number?" (showing a number of ob- jects.) " It is a lot of things together." " It is several things." "It is many things:" "Do not say 'lot' or 'several.'" "I am putting down a number of things upon the desk, now I take them up one by one. What did I do?" "You took them up one by one." " Do not say, 'you took them up.' Say you ' collected ' them." " What are they together after I have collected them." "A collection." "A number." "Take your slates and write what a number is." Each pupil should read his definition; the best (if correct) should be taken as a model and written by all. Lesson upon the Rule for Addition. " We will try to find the best way to add numbers upon the slate or blackboard." Teacher writes numbers on different parts of the board. "Can we add these figures as they are?" "No." "Yes." "No, we cannot." " Try it." "Yes, we can add them, but it is not the best way." " What is the best way ? " " Write them together." Teacher writes the numbers together, but does not put units under units, etc. " That is not the best way." " Please take your slates and write the best way of writing numbers to add." Thus each step in the process can be found out and written by the pupils. 10 In " carrying," "borrowing," the processes of long multiplication and division, "the best way" should be discovered by the pupils. See Fifth Year, T. R. a. 18. After the fundamental work has been mastered, noth- ing NEW CAN be introduced ; everything can and should be referred directly back to the simple acts of combination and separation. Terms "factor," "principal," "interest," "base," etc., are simply old, well-known friends under new names. 11 ro CO" ■* lO •* O r-T t-T CO~ 00* 05 ID o" rT ^l" O* rt" 3 ■I'+'S'S+'S l , S+'o'o+^+ + C-g I £ f ^ «f 1 «f f f" f -| . - th . r-T - - , ri , - I ° - - II * rf'i-l 1^4".^ l.ao^^H, .-II a S ■*" - *>" j -r °*" *-" S ^ o « « C -1 <" . MM .CO o **» ., ' -Jo m £» * * * + X • -|- *-" ^ -I- - + 2 ; 2" 5 £i S ° ^ M -f- " .,, - O ' II W | -*" J+H -X^N.|. + ® S " WS l!' V .«- H « «? ? S + + rH £ H.J, 0*S +J> ^ 5 -S XN oi ■= «-> CN O ^ ^> _L 7 "I" ,„- O A 'f .' 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Grant's Arith., Part II.; McVicar's Hand-book of Arith. ; White's Manual of Arith. ; How to Teach, pp. 67, 88. S. 16. See T. R. a, 1! Prim. If pupils are weak, and full of faults, begin the work again, and take time to repair the poor instruction. R. See S. 8. S. 17. The main purpose of this teaching is the development of mental power. The learning of each problem, definition, rule, or principle, presents an opportunity to increase the power of seeing and thinking. The explanation or learning by heart of one of these, deprives the pupil of one important means of growth; as if the trainer of gymnasts lifted all the heavy weights for (?) his pupils. Never tell a pupil anything that he can be led to discover for himself. S. 18. U. S. money, compound numbers, decimals, weights and measures can be made important aids if properly used, in teaching and applying the funda- mental rules. Simple examples only should be used. S. 19. Have pupils work together at blackboard quite often. S. 20. Walton's Tables are recommended for drills in calculation. R. See 13 a, D Gram. ; How to Teach, p. 113. i tn z o p o w « 3 a z ■< •j < z a a z T. R. a. Mental activity, delight in the work,* power to cornprehend new subjects, and the habit of trying to understand examples, are the best proofs' that the previous work has been well done. 12 a. Up to this grade the teaching has been purely elementary. Pupils have been seeing and doing; they have acquired clear, growing con- ceptions of numbers and operations with them by constant and systematic exercise. Now they are required to look closer at what they see and do ; to describe things and processes (definitions and rules), to discover reasons that make certain processes nec- essary (principles). This teaching must be purely objective. 13 a. Use V. 8. money, decimals and com- pound numbers in teaching fundamen- tal rules. Teach meter, decimeter, dekameter, li- ter, deciliter, dekaliter, gram, decigram, dekagram. 13 b. Addition and subtraction of fractions, using sim- ple examples, with objects (elementary work). 13 c. Writing bills, and keepjng ordinary simple ac- counts, measuring wood, carpets, room walls, &c. 13 d. Use very few examples exceeding millions. 16 a. Multiplication of fractions (elementary). 16 b. Simple examples in.percentage and interest. 16 c. Cubic measure, with objects, 16 a. Division of fractions (elementary). 16 b. Shorten process, by casting equal factors out of dividend and divisor. w i-l < P £ W Cfl H Test Results. 12. Numeration and Notation. 13. Addition. 14. Subtraction. 1.1 Multiplication. 16. Division. i— ! 1— 4 1— I 28 S 5? - C " . c ■5.5 fl s s s« E £ "0 ft • ,- .E 2 da t3 " h ct -Bis 3* =• -3 3.5H g C g O hS* - OJ U c .h •* 2 5 15 3,6 c o c T3 +j .s I . i-* t3 3 +* 5 ns . «c|i J 2 « c ° C ,„ rt ri O c $ «-*.2 £ ■«h -2 2 § S-S Si-a B fi i. j e je.S'Sa C g "1 * ST "43 p rt « =5 £ G^ sis ^'43 .2 a H . S o • ■«■< ph c H i S rH IN CO "5 S =3 3 5 6 CO c c o s f 1 fa x: h * •§ ■43 .2 5 .-S 3 i - S3 I 5" ■! 5 SS'tSE"! a) O.K. o 3 o ts a « ,. x S r" s c 5 . **•&"§ J . s 1 s g g ag •E'S I 2 .n C-43-43 S,-, u o o rt 2 2 'H'ta **- PI ■ .— w 3 *■■ « pi_j ^ qj C fli il r G a.u a — C s, u SB1«S ° ~ ^ j: -^ *^ c JS "o ^ » = u ga S r S ^ 30 « w u Id a: w b a C Z O H « M (J D en R. Felter's Arith. ; White's Arith.; How to Teach, p. 180. Understand thoroughly the whole of this ayurse of study before attempting to test results. S. 7. S. 25. All commonly used tables should be thor- oughly known. Not used, dram (av. weight), roods j barrel, hogshead (not often). 3. lu. S. 26. A large number of examples in measure- ments of surfaces and solids, as floors, carpets, ceil- ings, wood, stone, timber, &c. Second and third pow- ers of numbers. Roots that are easily found. S. 27. The metric system should be compared with the cumbrous system, or lack of system, now in use. The miter, liter and gram should be made familiar objects to pupils. The simple principles should be learned. O H (J w a < < H HI Q U 19 a. All the work in compound numbers is limited to that wliich is practiced in common life. Weights and measures not commonly, used are not to be learned. Very little of addition, subtraction, mul- tiplication and division is to be taught. 19 b. 1. Reduction Descending. 2. Redtiction Ascending. 3. Weights. 4. Linear measure. 5. Surface measure. 6. Solid measure. 7. Dry and liquid measure. (Omit beer measure.) 8. Circular measure. Questions in the difference of latitude and longitude. 9. Time. Preparation for the study of interest. 10. Miscellaneous table. 11. Money. Few examples, showing difference be- tween U. S. money and English, French, and German moneys. 12. Fractional compound numbers, limited to — a. Common fractions to integers of lower denom- inations. b. Decimals to integers of lower denominations. c. 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O >i o ■S5-2 H aao» t tso-d I .2«.y "-o 2-cd c « 3 fen S.y 8ir ■ss . "a a o 3 * "^ a) *• J3 rt ^ 1.s en £* > "fee ■a IB 1 81 "So v o ■a" 5 a a ™ S-d o a « .a a ,„-■= ~ *■< a) o a) JS'S a) a w> > o a> a bo STa % a -. rt " -C '=§§'§ s °t) a g 3-a3,Ji £° X! — ' u ■*-» ■" rt « « £ «j o W » a a g lit!* S g-S.S S 4i c«.S 3 iS „^t8la , g :£ -.a as- a) M a) > •« xi-x: x! _u b ai- g»a*« S gS-o,H g- ft " yc El... i, (o -m ^■og'^aS" o a -H ^ **-. ° a a xi Sac OB § o 13 ■a = a c rt ■&>> «rft 8 & rt rt "SH 3 S 3 8s .2 rt a; C ! +J ig «■ rQ 5 a U O W ttJ 43 « _ OJ 6. Stg in B 53 ."£ -^ XI I w; ^ 3 ■""■>- S a ,££|£ "5«'S « £ a g « £ '5 -a a = oj^ 1 ^1 '• »>2xi ™ o St: MSp xi Sgg^ s -mXI- +3 2 ." " -a o • ;S| a- > ft " - ° x: xi a. rt Si rt -tJ g HsH a uH ^> ** p— .S aj-.a-S g u.SgS* a~.S— a •g ft o ai aT o — a o S & aT— ■£ " ^ d jS rt ■fif-Sg-g «•-* aj — iS a u a = -1-8 o rt-g .2 a a a" _-.-S «- o R o « gS ft ft *J 2 w . . •.-! "Xi O ft aUtJS «■■= « 5/3 ■" O *■ °X! = 1*1 g rt O rt O ° aj cu a* ft ^ f -1 aj t"" 1 v o _^- r» O 73 *q3 £ a C^ S rt ii £.3 2 f ^l.-Srt 5« Bl .TJ !^ = .2 ° « ° x: — _- ^ aj o « 6 2 rt ai ftg in b a c R to rt rt s S 4) £,"[ rt • S3 rt "T I rt fci S e.S.g . a ■ "II O.JJ „- o 5 a a mj5 » g « IB ■3 ° > » xi -£S "^3 O u C rt 0-- rt S ■s rt +i - O «>•&« ■ gSqs "ch » o a i s rt +3 ft > 'c8 v 4-> U'i j 4) 1 *■* s* ft.g (U aj Hft W3 A -S | SI 1 >> Si o ^3 tee 4rf O 0(2X1 rt U « •fi a h C T3 ^2 -J Oh>» WU o o . m- a"*; a o'.o 55.0 g-a ft-a a5 ft ■«3-3 S* B.H.a a mi u Use the opposite sides of the face of the cu- bical body to teach that two lines are parallel. Use the two adjacent sides of the face to teach that two lines are perpendicular to each other. Use the adjacent sides of a face which is an oblique parallelogram to teach that two lines are inclined. Speak of two lines as being parallel, not of two parallel lines. Use the two sides of a face which is an oblique angled parallelogram to teach tlie oblique angle' and its varieties. The angle comes as one part of the face of the cubical body. Use a right angle cut "from a piece of card in measuring the angles. Let the pupils make the faces of the cyl'mdri- body and the cubical body on the slate. Use a number of rectangular blocks of differ- ent sizes. Have pupils find other rectangulaf bodies and note their parts. Explain the word " rectangular " as applied to the face, — as a face having all its angles rigbt angles. Teach that two lines are parallel to each other when they have the same direction. Teach that two lines are inclined to each other when one leans either toward or from the other. Teach that two lines are perpendicular to each other when they differ in direction and one nei- ther leans toward nor from the other. Teach that the two sides of the face of the cubical body extending from the -same point in different directions form an angle. Teach that when the sides of the angle are perpendicular to each other the alible is a right angle, when they are* inclined to each other the angle is oblique. Teach the varieties of oblique angles. Measure the faces of cylindrical body by a piece of card of size of one face to show .that they are equal. Measure the sides and angles of the faces of the cubical body to show that they are equal. 1 The form of the body is determined by the faces which bound or limit it. Hence in teach- ing the form of a new class of bodies observe the body first in its faces as a whole, then its parts, then the number and qualities of the faces. 7. KelatWe position of two lines. Two lines parallel to each other. Two lines inclined to each other. Two lines perpendicular to each other. •SJS C bo S — — - s I »■§. . « e s < o 9. The Faces of these bodies. Their number and the qualities of their parts. Spherical body — .surface one, no faces. Cylindrical body — two equal plane faces, per- fectly round or circidar, one curved face. Cubical body — faces have four straight, equal sides, four right angles ; faces are square. 10. Rectangular bodies. All plane faces as -wholes. Parts — faces, edges, corners. Faces — have four straight sides, four right- angles, opposite sides parallel ; all the faces are rectangular. 35 c E -a o i «r .2 4 =3 o o .a (A O O to in J- rt — ■ • u 3 .1 "3 «J rt t>c£ 5j 5 o <*■» TJ TJ g> o * j5 li J2 « .a fi s s >- _ « c ■ P/ +3 a *o rt o X £ w >-■ aj "" , Td'jS t; ca tn " rt rt rt Sfeg' ■ T3 O ■g « > S-^H " 3 « E •Be* = f « ■5:5 JS"S "_ so, ^h o id J" c l«p o O. u u rt S t, 4 u ° rt « £ s "-a ! •£ 3 g H. — £ : ?« S ! is. „- & : «s «■ ' a. > -2 u i 5 K & p "rt »■ ! •■ S •rf13 cfl i°'E S-B g -O »R o o : S « to ^3 C .8 j= o x B j. LI U "tJ ° U tf « O -.5 " tp 5 j s «J - 0) C^j 1 " *■ to o ■" « £ £ *3 o f & i 1 _ a) •— i "O *S &*^> c! c P j; & I.S- I « o « o •^ •? * -5 1| A3 S - 3 ^ « re 2 -g - ?S (/I « "3 -° .8 O u ^-g t. S -3 J 2 -5 C _ •3 a »h ^ S 1 "" m '3 J X a." 3 8 u •a -='5 o l-s s ago? ■s-S-a - " « •?■=•" rt ^ I ^ g in A ? « c « a if t « » ~ "> * ■£ in ». < s »■< so e ; ST 88 Let the pupils draw and name as directed above. Use the gonigraph. Have many examples of each kind so as to give the pupil an idea of the extent «f the class, as well as of the form. Let the pupils draw and name the polygons. Use the gonigraph. Other polygons may be taught if needed. Polyedral bodies cut from thick pasteboard make good illustrations. Teach the quadrilaterals by using such bodies as will show the different varieties of quadrilat- erals in their faces. The faces of cubical and rectangular bodies will illustrate the square and rectangle. Teach rhomb and rhomboid by using bodies which have bases of this form. Teach parallelogram by using all the bodies in which the opposite sides of the faces are par- allel. Teach trapezoid and trapezium by using bod- ies which have bases of this form. Teach the different polygons by using the faces of the polyedraL bodies which show them. Teach' in such a way as to explain the mean- ing of the name applied to each form. 1 (3) Quadrilaterals. As J a whole— any face which has four straight sides ^nid four angles. Parts — sides and angles. A Square — a quadrilateral which has four right angles and four equal sides. A Rectangle — a quadrilateral which has four right angles, two long sides and two short sides. A Rhomb — a quadrilateral which has four oblique angles and four equal sides. A Rhomboid — a quadrilateral which has four oblique angles, two long sides, and two short sides. A Parallelogram — a quadrilateral wliich -has its opposite sides parallel. A Trapezoid — a quadrilateral which has only two sides parallel. A Trapezium — a quadrilateral which has no two sides parallel. (4) Polygons. As a whole — any face which has more than four straight sides and more than four an- gles. Parts — sides and angles. A Pentagon — a polygon which has five sides and five angles. A Hexagon — a polygon which has six . sides and six angles. An Octagon — a polygon which has eight sides and eight angles. s