Mathematics for Junior High School Volume 1 Part I
[Pages:260]MATHEMATICS FOR :-JUNIOR HIGH SCHOOL
VOLUME 1
- - PART I
School Mathematics Study Group
Mathematics for Junior High School, Volume
Unit 3
Mathematics for Junior High School, volume :
Teacher's Commentary, Part I
Preparrd under the supervision of the Panel on Seventh and Eighth Grades ofthe School Mathematics Study Group:
R . D. Anderson J. A. Brown Lenore John
B.W. Jones
P. S. Jones J. R. Mayor
P.C.~osenbloom
Veryl Schult
Louisiana State University University of Delaware University of Chicago University of Colorado Urliversity of Michigan American Association for the Advancement of Science University oE Minnesota Supervisor of Mathematics, Washington, D.C.
New Haven and London, Yale University Press
Copyright @ 1960,1961by Yale University. Printed in the United States of America.
All rights reserved. his book may not be reproduced, in whole or in part, in
any form, without written permission from the publishers.
Financial support for che School Mathematics Study Group has been provided by the National Science Foundaaon.
Key ideas of Junior high school mathematics emphasized I n ' t h l s t e x t are: structure of arithmetic from an algebraic view: p o i n t ; the real number system as a progressing development;
;metric and non-metric relations in geometry. Throughout the 'materials theas ideas are associated w l t h t h e i r applications, .Important at this l e v e l are experience with and appreciation of abstract concepts, the role of d e f i n i t i o n , development of precise vocabulary and thought, experimentation, and proof. Substantial progress can be made on these concepts in the junior high school.
Fourteen experimental u n i t a f a r use In the seventh and
/ 1
eighth grades were written in by approximately 100 teachers
the summer of in 12 centers
1958 and t r i e d out i n various parts
1 of the country i n t h e ~ c h o o lyear 1958-59. On the basis of
I teacher evaluations theee unita were revised during the summer
of 1959 and, wlth a number of new units, were made a part of
sample textbooks f o r grade 7 and a book of experimental units
f o r grade 8 . In the school year 1959-60, these seventh and
e i g h t h grade books were used by about 175 teachers in many
parts of the country,and then f u r t h e r revised in the summer of
1960.
Mathematice is fascinating to many persons because of its opportunities f o r creation and discovery as well as f o r i t s u t i l i t y . It is continuously and rapidly growing under the prodding of both Intellectual curiosity and practical applica-
t i o n s . Even junior high school students may formulate mathematical questions and conjectures which they can test and perhaps settle; they can develop systematic attacks on mathematical problems whether or n o t the problems have routine
OP immediately determinable solutions. Recognition of these important factors has played a considerable p a r t in selection of content and method in thls t e x t ,
1
We firmly believe mathematics can and should be studied
i with success and enjoyment. ~t is o u r hope that this t e x t may
1 I
g r e a t l y assist all desirable goal.
teachers
who
use
it
to
achieve
thls
highly
1
~eprelim1na~eedltionofthiavolumewaspreparedatawritingaeaaionheldatthe
University of Michigan during the summer of 1959, baaed, in part, on m t e r l a l prepared at the flrat SWG writing session, h e l d at Yale University Zn the summer of 19%. This rev i a i o n was prepared at Stanford University In the summer of 1960, t a k i n g into account the cla5smam experience with the preliminary edition during the academic year 1959-60. The following i s a l i s t of all thoae who have participated i n the preparation of this
volume.
. R .D Anderaon, Louisiana State University
B.H. Arnold, Oregon State College J.A. Brown, University of Delaware Kenneth E, Brown, U.S. Offlce of Education Mildred B. Cole, K.D. Waldo Junior Wgh School, Aurora, I l l i n o i a B.H. Colvln, Weing Scientific Research Laboratorlee 3 . A . Cooleg, Univeraity of TennesBee Richard Dean, California I n s t i t u t e o f Technology H.M. k h m a n , University of Buffalo L . Roland Genise, Brentwood Junior High School, Brentwood, New York E. Glenadine Gibb, Iowa S t a t e Teachers College Richard Good, Universlty o f Maryland Alice Hach, Racine Public Schools, Racine, Wlaeonain S.B. Jackson, University of blaryland Lenore John, University High School, Unlvereity of Chicago
. B .U Jones, University of Colorado
P.S. Jones, University of Michigan Houston Kames, Louisiana State University Mildred Keif'fer, Cincinnati Public Schools, Cincinnati, Ohio Nick Lovdjiefr, Anthony Junior High School, Mnneapolla, Minnesota J.R. Mayor, AmerLcan Association for the Advanoement of Science Sheldon Meyers, Educational Testing Service Muriel M i l l a , H i l l Junior High School, Denver, Colorado
P .C. Rosenblcom, University of Minnesota Elizabeth Roudebuah, S e a t t l e Public Schoola, S e a t t l e , Washington
Very1 Schult, Washington Public Schools, Washington, D.C. QeoPge Schaefer, Alexis I. DuPont High School, Xilinington, Delaware Allen Shielda, University of Mlchigan Rothwell Stephens, Knox College John Wagner, Sohool Mathematics Study Group, New Haven, Connecticut Ray Walch, Weatport P u b l i c S c h o o l e , Meetpert, Connecticut O . C . Webbsr, University of Delaware A.B. Willcox, Amherst college
CONTENTS
rnFACE . . . . . . . . . . . . . . . . . . . . . . . Nom To TEACHERS . . . . . . . . . . . . . . . . . . .
j
I
1.
. . . . . . . . . . . . . WHATISMATKEMATICS? . 1- 1 Mathematics as a Method of Reaaonlng . . . . . . . . . . 1- 2 Deductive Reasoning . . . . 1- 3 From Arithmetic t o Mathematics . . . . . . . . 1- 4. Kind8 of Mathematics . . . . . . . . . . . 1- 5 Mathematics Today . . . . . . . 1- 6 Mathematics aa a Vocation . . . . Mathenatica In Other Vocations i$. . . . . . 1I- Mathematice f o r Recreation . 1- 9 Highlighte of Flmt Year Junior High . . . . . . . . School Mathematics
. . . . . . . . . . . . + . . . . . . . . . 2 NUMEfUTION
13
. . . . . . . . . . . . . 2- 1 ~ i s t o r ~ofr N = ~ S
16
. . . . . . . . . . . . . 2- 2 TheDecimalSystem
18
. . 2- 3 Expanded Numerale and EZponentlal Notation 20
. . . . . . . . . . . 2- 4 Numerals in Base Seven
22
. . . . . . . . . . 2- 5 omp put at ion in k a e seven
26
. . . . 2- 6 Changing from Base Ten t o Base Seven
32
. . . . . . . . . . . 2- 7 Numerals In Other Bases
34
. . . . . . 2- 8 The Binary and Duodecimal Systems
36
. . . . . . . . . . . . . . . . . . . 2- g Summarg
45
. . . . . . . . . . SmpleQuestions forchapter2
47
. . . . . . . . . . . . . . . . . . . UHom NUMBeRS
. . . . . . . . . . . . . . 3- 1 Counting Numbers
. . 3- 2 Commutative Properties for Whole Numbera
. 3- 3 . Associative Properties for Whole Numbers
. . . . . . . . . . 3- 4 The Distributive Property
. . . . . . . . 3- 5 Set8 and the Closure Property
. . . . . . . . . . . . . 3- 6 fnverae Operations
. . . . . . . 3- 7 Betweme88 and the Number Line . . . . . . . . . . . . . . . 3 - 8 TheNurnberOne . . . . . . . . . . . . . . . 3- 9 The Number Zero
. . . . . . . . . . . . . . . . . . . 3-10 Summ~w
. . . . Answera t o 'HOW A r e You
Questions
. . . . . . . . . . Sample Questions for Chapter 3
53 53
54
56 58 62
64 66
67 69
70
71
72
. +Included In etudent text only
vii
. . . . . . . . . . . . . . . . . . . Chapter 4
. . . . . . . . . . . NON-METRICGEOmTRY . . . . . 4- 1 Points. Lines. and Space . . . . . . . . . . . . . . 4.2 Planes . . . . . . . . . 4- 3 Namea and Symbols . . . . . . . 4- 4 ~ n t e r s e c t i o nor sets
. 4- 5 ~nteraectionsof Lines and Planes
......
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go
82
84 86
4- 6 Segmenta
. . . . . . . . . . . . . . . . 4- 7. Separations . . . . . . . . . . . 4- 8 Angles and Triangles . . . . . . . . . 4- 9 One-to-one Correspondenoe . . . . . . . . . . . . 4-10 SimpleClosedCumres . . . . . . . . . . Sample Questions for Chapter 4
88 90
92
94 97 99
5 .
. . . . . . . FACTORING AND PRIMES
. . . . . . . . 5- 1 Primes . . . . . . . . . 5- 2 Factors . . . . . 5- 3 D i v i s i b i l i t y . 5- 4 Greatest Common Factor
. 5- 5 Remindera in Division
. . . . . . . . . 5- 6 Review . . Least Comon Multiple
.I. . . . . . . . . Summary
Sample Questions f o r Chapter 5
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105
1?08 114 117 121 125 130 134 139
6 .
. . . . . . . . . . . .. .. .. .. .. .. . . THERATIONALNUMBERSYSl%M
. . . . . . . . . . Overview
. 6- 1 Hiatory of Fractions
. . . 6- 2 ~ational umbers . 6- 3 Properties of Rational
.... .... .... ....
Numbera
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6- 4
. * . . . . . . . . . . 6- 5 . . . . . 6- 6 . . . . . . . . 6- 7
Re~lpmcala Ualng the Number Line Multlplicatlon of Rational Numbers
D i v i s i o n of Rational Numbere
6- 8. Addition and Subtraction of Ratloml Numbers
. . . . . . . . 6- 9 and 6-10. Ratio and Decimsls . . . . . . . .. .. .. .. .. .. .. .. .. .. 6 6.11 Orderlng
Sample mest i o n s i o C~hapter
7 .
. . . . . . . . . . . . . . . . . . MEASUREMENT
. . . . . . . . . . . Introduction . . . 7- 1 Counting and Meaauring . 7- 2 Subdivision and Measurement
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7- 3 Subdividing U n i b of Measurement
. . . . . . . . . . . . . . . 7- 4 Standard Unite . 7- 5 Precision of Measurement and the Oreateat
. . . . . . . . . . . . . Possible Error . . . . . . . . . . . . 7- 6 Measurement of Angles . . . . . . . . . . Sample Queatiom f o r Chapter 7
. 212 8.
ARRA. VOLUME. WEIGHTAND TIME
. . . . . . . 8- 1 Rectangle . . 8- 2 Rectangular P r i s m . . . . 8- 3 Other Meaeums
Sample Questtom f o r Chapter
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6
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217
23 245 252
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