Tài liệu hay dành cho giáo viên toán và học sinh tham khảo . Nội dung sách gần với chương trình toán lớp 4, 5 của VN. Nhiều cách tiếp cận hay, nhẹ nhàng giúp học sinh hứng thú và học toán một cách tự nhiên. Nhiều ví dụ minh hoạ, bài tập thực hành hay, gần gũi với cuộc song hàng ngày. Hình vẽ, màu sắc bắt mắt,... Tài liệu giúp giáo viên toán có thêm nguồn tham khảo để hoàn thiện phương pháp giảng dạy, bên cạnh đó cũng giúp giáo viên phát triển vốn tiếng anh, rèn luyện kỹ năng dạy toán song ngữ cho học sinh. Sách hơn 500 trang,...
Trang 2Sadlier-Oxford
A Division of William H
Sadlier, Inc
New York, NY 1002
Trang 3AUDIO GLOSSARY
From A to Z Find the meanings and hear the pronunciations
of math words and phrases.
ALTERNATIVE TEACHING MODELS
Tutorials Watch and listen to these animated math lessons
VIRTUAL MANIPULATIVES
Manipulatives Practice and model math concepts with virtual manipulatives.
PRACTICE
Problem of the Day Tackle a new problem every day!
Skills Update Review your skills with Lesson and Practice pages.
Math Minutes Race against the clock with timed activities!
Practice Activities Practice makes perfect with these fun activities!
Vocabulary Activities Review your math vocabulary while playing Hangman or Word Scramble
ENRICHMENT
Activities Challenge yourself with these interactive activities.
MATH ALIVE AT HOME
Take-Home Activities Share your math experience at home!
Technology Resources:
www.progressinmathematics.com
SGT 2
Trang 4# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Grade home Glossary home
www.progressinmathematics.com
Choose the fi rst letter of a term you want to review
1
Click on the term
2
Listen as the glossary pronounces the word
If you are not sure what a certain word means or how
to pronounce it, use your online Audio Glossary The glossary is easy to use Just choose your grade level and the fi rst letter of the term you want to review
Trang 5Red Team Blue Team Green Team
www.progressinmathematics.com
Trang 6Virtual Manipulatives are
visual models that you
can actually move or
manipulate to show what
is happening You can
use these tools to build
numbers, rotate shapes,
and even jump on a
number line.
Select your grade and the
chapter you are working
on The manipulatives
that are listed will be
ones that you can use to
visualize the concepts of
the chapter.
SGT 5
Trang 7GRADE 5
PRACTICE
Click Practice Activities.
There is an interactive activity for
each chapter in your textbook
The activity practices the most
important skills of the chapter
Use the activity while you are
learning the skills, or come back
to it later to review.
Click Math Minutes.
You can practice your basic facts
as well as compute with larger
numbers to see how accurately
you can compute if you are given
a time limit
Click Vocabulary Activities.
In each chapter, you will be
learning new math terms that
you will need to know A good
way to review these terms is to
play either the Hangman game
or Word Scramble in your online
Trang 8GRADE 6
GRADE 3
*Whiteboard projectable only. GRADE 3
ENRICHMENT
Click Skills Update.*
Print Skills Update lessons
and practice pages to review
previously taught math skills
and concepts.
Click Activities.
The Enrichment activities
online are topics that go
beyond what you are learning
in class.
Each activity starts with a page
that explains the concept and
then gives you time to practice
Click Problem of the Day.*
Sharpen your
problem-solving skills every day
Print and solve one
problem each day!
Trang 9Dear Family, Today our class began Chapter 1 We will learn about place value Let’s dothe activity below together so I can review the skills I will need in order tounderstand the math in this chapter Then we can read some of the newvocabulary I will learn in Chapter 1.
Love,
How Many Tens, How Many Ones?
With your child, list the age of everyone in your family
on a sheet of paper Ask your child to say how many tens and how many ones there are in each age.
Draw a frame like the one at the right for each family member Tell your child to write in each frame the number of tens and ones for each age Then have her/him write an addition with the number of tens and the number of ones for each age, and find the sum.
expanded form shows the place value of the digits
in a number
600 ⫹ 40 ⫹ 7 standard form 647 thousand
nearest ten the number achieved after rounding
to the nearest ten
25 1 2 nearest hundred the number achieved after rounding
to the nearest hundred
We explored patterns of skip counting with 2s, 3s, 4s, 5s, and 10s, whichwill help us to learn multiplication facts We practiced rounding 3- and4-digit numbers to the nearest ten, hundred, or thousand This sk
ill is necessary for estimating with numbers We also worked with money,which will help us make and count change.
Love,
Key Skills and Concepts
Students’ learning in Chapter 1 was guided by giving particular emphasis to the following key skills and concepts:
cano Este conocimiento es necesario para hacer estimaciones con números.Tambiénpracticamos con dinero, lo cual nos ayudará a la hora de dar o recibir cambio.
Con cariño, _
Destrezas y conceptos claves
Lo que aprendieron los estudiantes en el capítulo 1 se hizo poniendo énfasis
en las siguientes destrezas y conceptos claves:
Click Take-Home Activities.
Keep your family involved in
what you are learning For
each chapter, there are two
letters to your family Use the
fi rst letter at the beginning
of the chapter, to review
previously learned skills with
a family activity, and read
about the new skills you will
learn The second letter tells
your family about the skills you
learned in the chapter and has
another fun activity that you
and your family members can
Trang 10R James Milgram
Professor of Mathematics Stanford University Palo Alto, CA
Madelaine Gallin
Former Math Coordinator Community School District #6 New York, NY
Tim Mason
Title 1 Specialist Palm Beach County School District
West Palm Beach, FL
Lucy Lugones
Math Coordinator
St Luke’s School Whitestone, NY
Rosalie Pedalino Porter
Consultant Bilingual/ESL Programs
Amherst, MA
Trang 11Copyright © 2009 by William H Sadlier, Inc All rights reserved
This publication, or any part thereof, may not be reproduced in any form, or by any means, including electronic,
photographic, or mechanical, or by any sound recording system, or by any device for storage and retrieval of information, without the written permission of the publisher Address inquiries to Permissions Department, William H Sadlier, Inc.,
9 Pine Street, New York, NY 10005-1002.
is a registered trademark of William H Sadlier, Inc.
Printed in the United States of America
ISBN: 978-0-8215-3605-6
Progress in Mathematics for more than sixty years.
The publisher wishes to thank the following teachers and administrators, who read portions of the series prior to publication, for their valuable contributions
Brandy Roth
Grade 3 Teacher Kissimmee, FL
Barbara Murphy
Grade 4 Teacher Chesterfield, MO
Sr Maristella Dunlavy, O.P
Principal Springfield, IL
Sara Kobylarz
Grade 3 Teacher Bronx, NY
Sr Martha Carmody, O.P
Grade 4 Teacher Springfield, IL
Jeannine Frey
Grade 3 Teacher Chesterfield, MO
Linda Hamby
Grade 5 Teacher DesPeres, MO
Jacqueline A Byrd
Grade 5 Teacher Chesterfield, MO
Mary E Stokes
Grade 5 Teacher Oak Forest, IL
Grades 3–6 Reviewers
Grade-Level Reviewers
Judith A Devine
Educational Consultant Springfield, PA
Stephanie D Garland
Educational Consultant
St Louis, MO
456789 RRDW 13 12 11 10
Trang 12Progress in Mathematics, now in its sixth decade of user-proven success,
is a complete basal mathematics program Written by experienced authors, it integrates a traditional course of study and today’s academicStandards with the most up-to-date methods of teaching
teacher-Progress in Mathematicsis designed to meet the individual needs of alllearners Teachers who useProgress come to understand that studentsmay progress as quickly as they can or as slowly as they must
In Grade 5, the concepts of fractions and decimals will be further developed,and your fifth grader will use all four operations with these number types.There will also be an increased emphasis on algebraic thinking Other topicsthat are studied include: statistics, geometry, measurement, probability,percents, and proportions Special attention is given to critical thinking,problem solving, mental math, and journalizing
But overall success in achieving the goals of this program depends onongoing teacher-family-student interaction It is important for you toencourage your fifth grader to achieve success in mathematics and enjoy
it as well You can help your student see math as useful and practical byrelating it to everyday situations It is also helpful to provide a quiet spaceand time for homework, and to reinforce the idea that by practicing mathconcepts and skills in your home environment, your student can have funwhile learning mathematics
Throughout the school year, you and your student can accessMath Alive At Home pages atwww.sadlier-oxford.com Thesepages include the math vocabulary of each chapter plusfun-filled activities that will help you relate the math yourstudent is learning in school to the real world
We know that by usingProgress in Mathematics
your fifth grader will not only learn to value math,but become a confident problem solver andlearn to reason and communicate
mathematically as well
Trang 13Introduction to Problem Solving
Problem-Solving Model 22
Problem-Solving Strategy: Logical Reasoning 24
Problem-Solving Strategy: Interpret the Remainder 25
Problem-Solving Strategy: Use More Than One Step 26
Problem-Solving Strategy: Make a Table 27
Problem-Solving Applications: Mixed Review 28
Letter to the Family iii
Skills Update A handbook for reviewing essential and previously taught skills An Introduction to Skills Update xii
Numeration I Place Value to Thousands 1
II Compare and Order Whole Numbers 2
III Round Whole Numbers 3
Whole Number Operations I Add and Subtract Whole Numbers 4
II Multiply One Digit 5
III One-Digit Quotients 6
IV Two-Digit Quotients 7
Fractions I Fractions 8
II Equivalent Fractions 9
III Add and Subtract Fractions: Like Denominators 10
Decimals Tenths and Hundredths 11
Geometry I Geometric Concepts 12
II Identify Polygons 13
Measurement I Customary Units of Length 14
II Customary Units of Capacity and Weight 15
III Metric Units of Length 16
IV Metric Units of Capacity and Mass 17
Statistics I Make Pictographs 18
II Make Bar Graphs 19
Probability I Equally/Not Equally Likely Outcomes 20
II List Outcomes 21
Trang 14Multiplication
Chapter Opener 65
2-1 Factors and Products 66
2-2 Properties of Multiplication 68
2-3 Mental Math: Special Factors 70
2-4 Patterns in Multiplication 72
2-5 Estimate Products 74
2-6 Zeros in the Multiplicand 76
2-7 Multiply Two Digits 78
2-8 Multiply Three Digits 80
2-9 Zeros in the Multiplier 82
2-10 Multiplication with Money 84
2-11 Problem-Solving Strategy: Use More Than One Step 86
2-12 Problem-Solving Applications: Mixed Review 88
End of Chapter Check Your Progress (Lessons 1–12) 90
Enrichment: Exponents 91
Chapter 2 Test 92
Cumulative Review 93
Chapter Place Value, Addition, and Subtraction Chapter Opener 29
1-1 What Is a Billion? 30
1-2 Place Value to Billions 32
1-3 Expanded Form 34
1-4 Thousandths 36
1-5 Decimals Greater Than One 38
1-6 Compare and Order Numbers 40
1-7 Rounding Numbers 42
1-8 Addition Properties/ Subtraction Rules 44
1-9 Estimate Sums and Differences 46
1-10 Addition: Three or More Addends 48
1-11 Subtraction with Zeros 50
1-12 Larger Sums and Differences 52
1-13 Roman Numerals 54
1-14 Problem-Solving Strategy: Guess and Test 56
1-15 Problem-Solving Applications: Mixed Review 58
End of Chapter Check Your Progress (Lessons 1–15) 60
Enrichment: Logic and Venn Diagrams 61
Chapter 1 Test 62
Cumulative Review 63
*
Trang 15Chapter
Division
Chapter Opener 95
3-1 Understanding Division 96
3-2 Division Patterns 98
3-3 Three-Digit Quotients 100
3-4 Larger Quotients 102
3-5 Zeros in the Quotient 104
3-6 Short Division 106
3-7 Explore Divisibility 108
3-8 Divisibility and Mental Math 110
3-9 Estimation: Compatible Numbers 112
3-10 Teens as Divisors 114
3-11 Two-Digit Divisors 116
3-12 Divide Larger Numbers 118
3-13 Divide Money 120
3-14 Order of Operations 122
3-15 Problem-Solving Strategy: Make a Table/Find a Pattern 124
3-16 Problem-Solving Applications: Mixed Review 126
End of Chapter Check Your Progress (Lessons 1–16) 128 Enrichment: Translate Algebraic Expressions 129
Chapter 3 Test 130
Cumulative Review 131
* * Chapter Number Theory and Fractions Chapter Opener 133
4-1 Explore Prime and Composite Numbers 134
4-2 Factors, Primes, and Composites 136
4-3 Greatest Common Factor 138
4-4 Fraction Sense 140
4-5 Fractions in Lowest Terms 142
4-6 Fractions in Greater Terms 144
4-7 Multiples: LCM and LCD 146
4-8 Mixed Numbers 148
4-9 Fractions Greater Than or Equal to One 150
4-10 Compare and Order Fractions 152
4-11 Problem-Solving Strategy: Make an Organized List 154
4-12 Problem-Solving Applications: Mixed Review 156
End of Chapter Check Your Progress (Lessons 1–12) 158 Enrichment: Density of Fractions 159
Chapter 4 Test 160
Cumulative Review 161
Trang 165-3 Add Three Fractions 168
5-4 Add Mixed Numbers 170
5-5 Rename Mixed Number
5-9 Subtract Mixed Numbers 180
5-10 Subtraction with Renaming 182
*
*
Chapter
Fractions: Multiplication and Division
and Whole Numbers 202
6-4 Multiply Fractions Using
the GCF 204
6-5 Rename Mixed Numbers
as Fractions 206
6-6 Multiply Fractions
and Mixed Numbers 208
6-7 Multiply Mixed Numbers 210
6-14 Divide Mixed Numbers 224
6-15 Estimate Products and Quotients
with Mixed Numbers 226
Trang 17Chapter
Probability and
Statistics
Chapter Opener 237
7-1 Probability 238
7-2 Tree Diagrams 240
7-3 Independent and Dependent Events 242
7-4 Collect and Organize Data 244
7-5 Range, Median, Mean, and Mode 246
7-6 Graphing Sense 248
7-7 Line Plots 250
7-8 Histograms 252
7-9 Make Line Graphs 254
7-10 Interpret Circle Graphs 256
7-11 Problem-Solving Strategy: Use a Model/Diagram 258
7-12 Problem-Solving Applications: Mixed Review 260
End of Chapter Check Your Progress (Lessons 1–12) 262 Enrichment: Double Line and Double Bar Graphs 263
Chapter 7 Test 264
Cumulative Review 265
Chapter Decimals: Addition and Subtraction Chapter Opener 267
8-1 Decimal Sense 268
8-2 Decimals and Place Value 270
8-3 Add Decimals 272
8-4 Estimate Decimal Sums 274
8-5 Add More Decimals 276
8-6 Subtract Decimals 278
8-7 Estimate Decimal Differences 280
8-8 Subtract More Decimals 282
8-9 Problem-Solving Strategy: Use More Than One Step 284
8-10 Problem-Solving Applications: Mixed Review 286
End of Chapter Check Your Progress (Lessons 1–10) 288 Enrichment: Scientific Notation 289
Chapter 8 Test 290
Cumulative Review 291
viii
Trang 18*
*
*
Chapter
Decimals: Multiplication and Division
Chapter Opener 293
9-1 Multiply by 10, 100, and 1000 294
9-2 Estimate Decimal Products 296
9-3 Multiply Decimals by Whole Numbers 298
9-4 Multiply Decimals by Decimals 300
9-5 Zeros in the Product 302
9-6 Divide by 10, 100, and 1000 304
9-7 Divide Decimals by Whole Numbers 306
9-8 Zeros in Division 308
9-9 Estimate Decimal Quotients 310
9-10 Estimate with Money 312
9-11 Problem-Solving Strategy: Write a Number Sentence 314
9-12 Problem-Solving Applications: Mixed Review 316
End of Chapter Check Your Progress (Lessons 1–12) 318 Enrichment: Fractions to Decimals 319
Chapter 9 Test 320
Cumulative Review 321
Chapter Geometry Chapter Opener 323
10-1 Measure and Draw Angles 324
10-2 Identify Angles 326
10-3 Polygons 328
10-4 Congruent and Similar Figures 330
10-5 Triangles 332
10-6 Quadrilaterals 334
10-7 Perimeter 336
10-8 Circles 338
10-9 Circumference 340
10-10 Lines of Symmetry 342
10-11 Transformations 344
10-12 Tessellations 346
10-13 Problem-Solving Strategy: Use a Diagram/Model 348
10-14 Problem-Solving Applications: Mixed Review 350
End of Chapter Check Your Progress (Lessons 1–14) 352 Enrichment: Triangular and Square Numbers 353
Chapter 10 Test 354
Cumulative Review 355
Trang 19*
*
*
*
Chapter
Measurement Topics
Chapter Opener 357
11-1 Relate Customary Units of Length 358
11-2 Relate Customary Units of Capacity 360
11-3 Relate Customary Units of Weight 362
11-4 Temperature 364
11-5 Units of Time 366
11-6 Time Zones 368
11-7 Compute with Customary Units 370
11-8 Problem-Solving Strategy: Use More Than One Step 372
11-9 Problem-Solving Applications: Mixed Review 374
End of Chapter Check Your Progress (Lessons 1–9) 376
Enrichment: Pascal’s Triangle 377
Chapter 11 Test 378
Cumulative Review 379
Chapter Metric Measurement, Area, and Volume Chapter Opener 381
12-1 Metric Measurement 382
12-2 Relate Metric Units of Length 384
12-3 Relate Metric Units of Capacity 386
12-4 Relate Metric Units of Mass 388
12-5 Square Measure 390
12-6 Areas of Rectangles and Squares 392
12-7 Areas of Parallelograms and Triangles 394
12-8 Solid Figures 396
12-9 Surface Area 398
12-10 Cubic Measure 400
12-11 Volume 402
12-12 Estimate Volume 404
12-13 Problem-Solving Strategy: Draw a Picture 406
12-14 Problem-Solving Applications: Mixed Review 408
End of Chapter Check Your Progress (Lessons 1–14) 410 Enrichment: Views of Solid Figures 411
Chapter 12 Test 412
Cumulative Review 413
x
Trang 20More Concepts in
Chapter Opener 439
14-1 Algebraic Expressions and Equations 440
14-2 Properties of Equality 442
14-3 Addition and Subtraction Equations 444
14-4 Multiplication and Division Equations 446
14-5 Equations with Fractions 448
14-6 Introduction to Integers 450
14-7 Compare and Order Integers 452
14-8 Add Integers with Like Signs 454
14-9 Add Integers with Unlike Signs 456
14-10 Subtract Integers 458
14-11 Multiply Integers 460
14-12 Divide Integers 462
14-13 The Coordinate Plane 464
14-14 Function Tables 466
14-15 Functions and Coordinate Graphs 468
14-16 Problem-Solving Strategy: Write an Equation 470
14-17 Problem-Solving Applications: Mixed Review 472
End of Chapter Check Your Progress (Lessons 1–17) 474 Enrichment: Rational Numbers 475
Chapter 14 Test 476
End-of-Book Materials Still More Practice 477
Brain Builders 489
Mental Math 493
Glossary 502
Index 507
Symbols and Tables 515
* Chapter Ratio, Proportion, and Percent Chapter Opener 415
13-1 Ratios as Fractions 416
13-2 Proportions 418
13-3 Scale and Maps 420
13-4 Relate Fractions to Percents 422
13-5 Relate Percents to Decimals 424
13-6 Find the Percent of a Number 426
13-7 Use Percent 428
13-8 Problem-Solving Strategy: Combine Strategies 430
13-9 Problem-Solving Applications: Mixed Review 432
End of Chapter Check Your Progress (Lessons 1–9) 434
Enrichment: Percent Patterns 435
Chapter 13 Test 436
Cumulative Review 437
Trang 21Progress in Mathematicsincludes a
“handbook” of essential skills, Skills Update,
at the beginning of the text These one-page
lessons review skills you learned in previous
years It is important for you to know this
content so that you can succeed in math
this year
If you need to review a concept in Skills
Update, your teacher can work with you,
using manipulatives, which will help
you understand the concept better
The Skills Update handbook can be used
throughout the year to review skills you
may already know Since many lessons
in your textbook refer to pages in the Skills Update, you can use a particularlesson at the beginning of class as a warm-up activity Or your class maychoose to do the Skills Update lessons at the beginning of the year so thatyou and your teacher can assess your understanding of these previouslylearned skills
You may even want to practice specific skills at home
If you need more practice than what is provided onthe Skills Update page, you can use the practicepages available online atwww.sadlier-oxford.com.These practice pages have an abundance ofexercises for each one-page lesson
A Review of Mathematical
Skills from Grade 4
Trang 22Place Value to Thousands
Write the place of the underlined digit Then write its value.
1 224_2 2 63_,666 3 _199,999 4 88_0,888
Place a comma where needed in each Then write the period name
for the underlined digit.
5 3 4 2 5 _9 6 _1 6 4 3 2 7 2 0 _0 0 6 0 8 _8 0 5 0 2 7
Write the number in standard form.
9 forty-five thousand, seven hundred sixty-two 10 five thousand, six
11 nine hundred thousand, seven 12 ten thousand, nineteen Write the word name for each number.
Four-digit numbers may be written with or
without a comma In numbers larger than
9999, use a comma to separate the periods
Word Name:
one hundred fifty-eight thousand,seven hundred six
Standard Form: 158,706
You can show 158,706 in a place-value chart
The value of each digit in a number depends
on its place in the number
In 158,706 the value of: Thousands Period Period Ones
hndred
s
ten
sone
1 5 8 7 0 6 ,
8is 8 thousands or 8000
Each period hasthree digits
Trang 23Compare and Order Whole Numbers
Write in order from least to greatest.
4 9458; 9124; 948; 972 5 3951; 3068; 369; 3547
6 99,407; 91,568; 90,999; 93,697 7 216,418; 215,783; 213,614; 221,986
Compare 363,420 and 381,787
To compare whole numbers:
Align the digits by place value
Compare the value of these digits
to find which number is greater
Start at the left and find the firstplace where the digits are different
So 381,787 363,420 You could also say 363,420 381,787
363,420381,787
To order whole numbers:
Align the digits by place value
Compare the digits in each place, starting with the greatest place
69,52019,478
160,43463,215
69,520
19,478160,434
63,215
69,52019,478160,434
means “is less than.”
means “is greater than.”
means “is equal to.”
Trang 24Round Whole Numbers
To round a number to a given place:
Find the place you are rounding to
Round 13,528 to the nearest ten.
Round to the nearest ten.
Round to the nearest hundred.
Look at the digit to its right
If the digit is less than 5, round down.
If the digit is 5 or more, round up.
Trang 25Add and Subtract Whole Numbers
To add or subtract whole numbers:
Add: 3458 2596
Round to estimate: 3000 3000 6000
Estimate
Align the numbers Add or subtract, starting
with the ones Regroup when necessary
More tens needed
Regroup Subtract Subtract
Think
1197 is close tothe estimate of 1000
Trang 26Multiply One Digit
Multiply: 7 816
First, estimate by rounding: 7 816
7 800 5600Then multiply
Multiply the tens
Add the regroupedtens Regroup again
Multiply the hundreds.Add the regroupedhundreds
Think
5712 is close tothe estimate of 5600
Trang 2777
)
DividendDivisor
Write theremainder
RemainderDividend
Trang 28Two-Digit Quotients
Divide:82 3 ?
The quotient begins in the tens place
Estimate: About how many 3s are in 8?
3 3 9 Try 2.
Repeat the steps to divide the ones.
Divide and check.
1 2 58)6.
to beginthe quotient
Think
3 8 Enough tens
Divide thetens
3 8 2
62
2)
Bring downthe ones
3 8 2)6
2 2
2 7
Multiply
3 8 26
Check
27381182
Trang 29
2 of the 3 cars in this parking lot face right.
of the cars face right
2 3
Standard Form:
Word Name: two thirds
2 3
Write the fraction for the shaded part or point on the number line.
Write the fraction in standard form.
Write the word name for each fraction.
A fraction is a number that names
one or more equal parts of a whole
or region, or of a set
2 3
The numerator tells the number ofequal parts being considered
The denominator tells the number
of equal parts in the whole or set
0
P
1
3 equal segments are between 0 and 1
Point P is 23 of the way between 0 and 1
0
P
1
Trang 30Equivalent Fractions
One half ( ) of the whole
is shaded blue
1 2
Two fourths ( ) of the whole
is shaded blue
2 4
Four eighths ( ) of the
whole is shaded blue
4 8
1 2
2 4
4 8
1
2 , 24 , and 48 are
equivalent fractions since
they name the same part
of the whole
Use the chart above to find equivalent fractions.
Use the chart above to compare Write ,, 5, or
1. 12 ?6 2. 13 ?6 3. 14 ?8 4. 15 10?
5.
9.
? 9
1
3 4
6 8
Trang 31Add and Subtract Fractions: Like Denominators
To subtract fractions
with like denominators:
Subtract the numerators
Write the difference overthe common denominator
3 5
1 5
Study these examples.
6 9
Use fraction strips or number lines to model each sum or difference.
Then write an addition or a subtraction sentence.
Add or subtract.
13. 1012
8 12
4 6
3 6
7. 108 105 8. 45 25
0 2 0 3. 25 25 0 4. 57 27
12. 78
3 8
To add fractions with
like denominators:
Add the numerators
Write the sum over thecommon denominator
2 4
1 4
1. 36 26
0 9. 107
2 10
10. 15
3 5
11. 49
4 9
0 5. 59 39 0 6. 58 28
4
3 4
2 4
5
2 5
3 5
4 5Think
Think
213
312
ThinkThink
9
9
Trang 32Tenths and Hundredths
5. 102 6. 105 7. 1009 8. 1006 9. 10017 10. 10023Write as a decimal.
Write a fraction and a decimal for each.
A decimal pointseparates the whole numberpart from the decimal part
0 shows no ones 0 shows no tenths
Equivalent decimals showthe same amount
1 10
one hundredth
1 100
A number less than one can be written
either as a fraction or as a decimal
1 tenth
10 hundredths
Trang 33F E
K R J
B C
A line is a set of points
in a plane that forms a
straight path and extends
A line segment is part of
a line with two endpoints
A ray is part of a line that
starts at an endpoint and
extends indefinitely in
one direction
P
A plane is a flat surface
that extends indefinitely
in all directions
Intersecting lines
are lines that meet
at a common point
Parallel lines are lines
in the same plane that
never intersect
Trang 34Identify Polygons
A polygon is a closed plane figureformed by line segments The line segmentsare called sides Pairs of sides meet at apoint called a vertex (plural: vertices)
Polygons are classified by the number
of sides or vertices (or angles)
verticessideangle
Trang 35Customary Units of Length
about 1 in long about 1 ft tall
The distance a person can walk
in 20 minutes is about 1 mile
about 1 yd wide
ft in.
12 24 36 48 60
Which unit would you use to measure? Write in., ft, yd, or mi.
1 length of an eraser 2 width of a board 3 distance between 2 cities
4 height of a desk 5 length of a soccer field 6 width of a quarter
Write the letter of the best estimate.
7 length of a pencil a 4 yd b 4 in c 4 ft
8 height of a basketball player a 6 ft b 6 in c 6 yd
Compare Use ,, 5, or
9 8 ft ? 96 in 10 6 yd ? 2 ft 11 1 mi ? 3000 yd
The inch (in.), foot (ft), yard (yd), and
mile (mi) are customary units of length 12 inches (in.)
Before you can compare measurements in different units,
you need to rename units
Compare: 4 ft 52 in
You can make a table
4 ft 48 in 48 52 So 4 ft 52 in
?
Trang 36Which unit would you use to measure the weight of each? Write oz or lb.
7 a toaster 8 a television 9 a dog
10 an envelope 11 a feather 12 a bag of oranges
Complete each table.
The ounce (oz) and pound (lb)are customary units of weight
oz lb
14.
Which unit would you use to measure? Write c, pt, qt, or gal.
1 juice in a pitcher 2 ice cream in a carton 3 paint in a can
4 water in a swimming pool 5 milk in a recipe 6 water in a bucket
pt c
Customary Units of Capacity and Weight
16 ounces (oz) 1 pound (lb)
Trang 37Metric Units of Length
Which metric unit of length is best to measure each?
Write cm, m, or km.
1 length of a car 2 depth of the ocean 3 height of a person
4 width of a tape 5 thickness of a sandwich
Write the letter of the best estimate.
The centimeter (cm), decimeter (dm), meter (m),
and kilometer (km) are metric units of length 1 m
Trang 38Metric Units of Capacity and Mass
Which metric unit is best to measure the capacity of each? Write mL or L.
1 a bucket 2 a perfume bottle 3 a test tube
4 a bathtub 5 a can of juice 6 an eyedropper
Which metric unit is best to measure the mass of each? Write g or kg.
7 a computer 8 a peanut 9 an electric iron
10 a sugar cube 11 a comb 12 a bowling ball
The gram (g) and kilogram (kg)are metric units of mass
A paper clip has
a mass of about 1 g
A hardcover dictionaryhas a mass of about 1 kg
The milliliter (mL) and liter (L)are metric units of liquid capacity
20 drops of water
Complete each table.
L mL
13.
kg g
Trang 39Number of Students
506338147
1.
Kind
ScienceMedicineBiographyArt
FictionHistory
Number of Books
29854195147554256
Compact Disc Sales
Music
ClassicalCountryJazzRapRock
R & B/Soul
Compact Discs Sold
105886212384790450
Make a pictograph for each set of data.
1 2.
ScienceMedicineBiographyArt
FictionHistoryKey: Each stands for 100 books.Each stands for 50 books
Books in the Jackson Public Library
Make a pictograph to organize
the data at the right
To make a pictograph:
List each kind of book
If necessary, round the data tonearby numbers
Choose a symbol or picture torepresent the number of books
for each kind to make the key.
Draw symbols to representthe data for each kind
of book
Label the pictograph
Write the title and the key.
Trang 40Make Bar Graphs
Organize the data at the right
in a horizontal bar graph
To make a horizontal bar graph:
Use the data from the table
to choose an appropriate scale
Draw and label the scale on thehorizontal axis Start at 0
Draw and label the vertical axis
List the name of each item
Draw horizontal bars
to represent the data
Write the title of thebar graph
You can make avertical bar graph
by placing the scalealong the vertical axisand the items alongthe horizontal axis
Heights of Some U.S Waterfalls
Favorite Sports Activity
Sport Number of Students
Make a horizontal bar graph
for the data listed below.
Results of Canned Food Drive
Class Number of Cans