Go Get Maths Textbook P4 samplebook

Textbook

Prathomsuksa 4 © Pelangi Publishing (Thailand) Co., Ltd. 2022 All rights reserved. No part of this publication may be reproduced, stored in any retrieval system or transmitted in any form or by any means without permission of Pelangi Publishing (Thailand) Co., Ltd. 2022

BDRC304031_GoGetMaths TB Prelimpage P4.indd 1

885-87220-0359-3 First Published 2022

19/1/2565 BE 09:22

Contents Chapter 1

Numbers Lesson 1 Lesson 2 Lesson 3

Chapter 2

Chapter 3

Chapter 4

Chapter 5

2 7 12

20

Lesson 1 Lesson 2 Lesson 3 Lesson 4

21 24 27 29

Addition Subtraction Finding the unknowns Word problems

Multiplication and division

33

Lesson 1 Lesson 2 Lesson 3 Lesson 4 Lesson 5

34 41 47 49 53

Multiplication Division Finding the unknowns Word problems Number patterns

Mixed operations

60

Lesson 1 Lesson 2

61 63

Order of operations Word problems

Fractions

68 Types of fractions Equivalent fractions Comparing and ordering fractions Addition and subtraction of fractions Word problems

Time Lesson 1 Lesson 2 Lesson 3 Lesson 4

SG Maths TB P4 page i-iv.indd 3

Counting beyond 100,000 Comparing and ordering numbers Estimation

Addition and subtraction

Lesson 1 Lesson 2 Lesson 3 Lesson 4 Lesson 5

Chapter 6

1

69 75 80 85 90

93 Units of time Comparing duration of events Word problems Schedules

94 99 101 104

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Chapter 7

Decimals Lesson 1 Lesson 2

Chapter 8

Chapter 9

Understanding decimals Comparing and ordering decimals

110 123

Addition and subtraction of decimals

129

Lesson 1 Lesson 2 Lesson 3

130 137 142

Chapter 11

Addition of decimals Subtraction of decimals Word problems

Geometry Lesson 1 Lesson 2

Chapter 10

109

148 Geometric terms Angles

149 152

Squares and rectangles

164

Lesson 1 Lesson 2 Lesson 3 Lesson 4 Lesson 5 Lesson 6

165 169 175 179 183 187

Properties of squares and rectangles Drawing squares and rectangles Perimeter Area Perimeter and area of composite figures Word problems

Two-way tables and bar graphs

190

Lesson 1 Lesson 2

191 195

Two-way tables Bar graphs

Computational thinking

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203

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The big idea

Illustrates a scenario through which students can connect to the Chapter 1 chapter.

Numbers more than 100,000

Computational thinking

Special Features

Introduces a new approach for solving complex problems with confidence.

This bee farm has about 950,000 bees.

Is that a lot?

Lesson 1

Counting numbers more than 100,000

Lesson 2

Comparing and ordering numbers

Lesson 3

Estimation

Starting point

Provides questions to initiate thinking and jump-start learning.

Computational thinking is not about programming a computer or thinking like a computer. It is rather a set of systematic approaches to solving problems. Then, we can present the solutions in a way a computer or a human or both can understand.

There are four skills or elements in computational thinking.

Decomposition

Lesson 1

Breaking a complex problem into manageable, smaller problems

Types of fractions

Starting point

1 12

Look at these fractions.

Are they the same? What does each mean?

3 2

?

Algorithms

1 2

Learning to know

?

Abstraction

Focusing on relevant information, and removing irrelevant information

Proper fractions and improper fractions

1 2

Introduces new concepts using the CPA approach with engaging illustrations.

Numerator With this new approach, we will be able to tackle unfamiliar and complex problems with confidence.

It trains us to analyze information and deal with problems across disciplines. It will help us see a relationship between the school and the outside world.

Denominator

5 6

6 7

Computational thinking |

The fractions shown above are proper fractions.

A proper fraction is a fraction where the numerator is smaller than the denominator.

Thinking corner

Challenges students with unconventional questions to develop higher-order thinking skills.

Identifying similarities and differences, and observing similar patterns

Developing a set of step-by-step solution

?

Learning to know

Pattern recognition

203

Fun with Maths!

Are 2 , 3 and 5 proper fractions?

2 3 5 Chapter 5 | 69

Allows students to explore mathematical concepts actively either as an individual or in groups.

1. Work in pairs.

2. Write an improper fraction on a card and its equivalent mixed number on another card.

3. Make 10 sets of such cards.

4. Ask your partner to check the cards to ensure the improper fractions and their mixed numbers are written correctly.

5. Shuffle the cards and place them face down in rows.

6. Turn over any two cards.

7. If the cards match, keep the cards.

Repeat step 6.

8. If the cards do not match, it is your partner’s turn.

9. The person with more cards wins.

1. Circle the improper fractions. Cross the mixed numbers.

1 6

7 2 6 2

4 10 3 15

2 7

1 43 8 8

5 6 11

2. Convert each improper fraction to a mixed number.

4 9 15 (b) 4 = (c) 2 = (a) 3 =

23 (d) 7 =

3. Convert each mixed number to an improper fraction.

2 3 3 (a) 1 3 = (b) 1 5 = (c) 2 6 =

4 (d) 4 9 =

Try this

Provides various exercises to immediately evaluate students’ understanding.

74 | Mathematics Prathomsuksa 4

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Chapter 1

Numbers

This bee farm has about 950,000 bees.

Is that a lot?

Sg Maths TB P4 Chpt1-4.indd 1

Lesson 1

Counting beyond 100,000

Lesson 2

Comparing and ordering numbers

Lesson 3

Estimation

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Counting beyond 100,000

Lesson 1 Starting point

It is estimated that by the end of 2023, 10,899,698 people will be living in Bangkok.

How do you read this number?

Learning to know

Counting on from 100,000

100,000

100,000

100,000

100,000

100,000

100,000

100,000

100,000

100,000

100,000

1,000,000

10 hundred thousands make 1 million.

1,000,000

1,000,000

1,000,000

1,000,000

1,000,000

1,000,000

1,000,000

1,000,000

1,000,000

1,000,000

10,000,000

10 millions make 1 ten million.

10,000,000

10,000,000

10,000,000

10,000,000

10,000,000

10,000,000

10,000,000

10,000,000

10,000,000

10,000,000

100,000,000

10 ten millions make 1 hundred million.

2 | Mathematics Prathomsuksa 4

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100,000

10,000

1,000

1,000

100

100

10

1

100,000

10,000

1,000

1,000

100

100

10

1

100,000

10,000

1,000

100

100

10

1

10,000

1,000

100

10

1

1,000

100

10

1

๓๔๗,๘๕๕

347,855 ( ) Three hundred and forty-seven thousand eight hundred and fifty-five 10,000

1,000

100

100

10

1

100,000

1,000

100

100

10

1

100,000

1,000

100

100

10

1

100,000

1,000

100

100

1,000

100

1,000,000

100,000

1,000,000

1 1

๒,๔๑๕,๙๓๕

2,415,935 ( ) Two million four hundred and fifteen thousand nine hundred and thirty-five

100

10

1,000,000

100

10

1,000,000

100

10,000,000

1,000,000

10,000,000

100,000

1,000,000

๒๔,๑๐๐,๓๒๐

24,100,320 ( ) Twenty-four million one hundred thousand three hundred and twenty Chapter 1 | 3

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What do 10 hundred millions make?

How many zeros are there?

Place values

Learning to know

532,468 1

1

10

1

1

100

10

1

1

100

10

1

10

1

100,000

10,000

1,000

100

10

100,000

10,000

1,000

100

100,000

10,000

100,000 100,000

Hundred thousands (HTh)

Ten thousands (TTh)

5

3

Thousands Hundreds (Th) (H) 2

4

10

Tens (T)

Ones (O)

6

8

532,468 = 5 hundred thousands 3 ten thousands 2 thousands 4 hundreds 6 tens 8 ones 532,468 = 500,000 + 30,000 + 2,000 + 400 + 60 + 8 The digit 5 in 532,468 is in the hundred thousands place. Its value is 500,000.

The digit 3 in 532,468 is in the ten thousands place. Its value is 30,000.

The digit 2 in 532,468 is in the thousands place. Its value is 2,000.

The digit 4 in 532,468 is in the hundreds place. Its value is 400.

The digit 6 in 532,468 is in the tens place. Its value is 60.

The digit 8 in 532,468 is in the ones place. Its value is 8.

4 | Mathematics Prathomsuksa 4

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8,751,349 Millions (M) 8

Thousands Hundreds Ten Hundred (Th) (H) thousands thousands (TTh) (HTh) 7

5

1

3

Tens (T)

Ones (O)

4

9

8,751,349 = 8 millions 7 hundred thousands 5 ten thousands 1 thousand 3 hundreds 4 tens 9 ones 8,751,349 = 8,000,000 + 700,000 + 50,000 + 1,000 + 300 + 40 + 9 The digit 8 in 8,751,349 is in the millions place. Its value is 8,000,000.

The digit 7 in 8,751,349 is in the hundred thousands place. Its value is 700,000.

The digit 5 in 8,751,349 is in the ten thousands place. Its value is 50,000.

The digit 1 in 8,751,349 is in the thousands place. Its value is 1,000.

The digit 3 in 8,751,349 is in the hundreds place. Its value is 300.

The digit 4 in 8,751,349 is in the tens place. Its value is 40.

The digit 9 in 8,751,349 is in the ones place. Its value is 9.

1. Work in pairs.

2. Write a number with more than 5 digits on a piece of paper.

3. Show it to your partner.

4. Your partner will read out the number and say the value of each digit in the number.

The value of the digit 4 is 400,000.

5. Switch roles and repeat.

Chapter 1 | 5

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1. Count. Write in numerals and words.

10

1

1,000 1,000

10

1

10,000

1,000 1,000

10

1

10,000

1,000 1,000

10

1

10,000

1,000

10

1,000,000

100,000

10,000 10,000

1,000 1,000

1,000,000

100,000

10,000 10,000

1,000,000

100,000 100,000

Thai numerals:

100

Hindu-Arabic numerals:

Words: 2. Fill in the blanks. (a) 874,123 = 800,000 + 70,000 + (b)

= 200,000 + 60,000 + 3,000 + 700 + 30 + 4

(c) 4,624,382 = (d)

+ 100 + 20 + 3

+ 600,000 + 20,000 + 4,000 + 300 + 80 + 2

= 1,000,000 + 300,000 + 70,000 + 2,000 + 500 + 50 + 4

3. Fill in the blanks.

7,364,159 (a) The digit 7 in 7,364,159 is in the

place. Its value is

.

(b) The digit 3 in 7,364,159 is in the

place. Its value is

.

(c) The digit 6 in 7,364,159 is in the

place. Its value is

.

(d) The digit 4 in 7,364,159 is in the

place. Its value is

.

(e) The digit 1 in 7,364,159 is in the

place. Its value is

.

(f) The digit 5 in 7,364,159 is in the

place. Its value is

.

(g) The digit 9 in 7,364,159 is in the

place. Its value is

.

6 | Mathematics Prathomsuksa 4

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Lesson 2 Comparing and ordering numbers Starting point

765,897

There are so many digits in these two numbers.

How do we know which is the greater number?

Learning to know

7,025,674

Comparing numbers

Compare 5,741,354 and 597,056.

Compare the number of digits in each number.

5,741,354 has 7 digits.

597,056 has 6 digits.

The number with more digits is the greater number.

So, 5,741,354 is greater than 597,056.

5,741,354 > 597,056

or

5,741,354

597,056

597,056 is smaller than 5,741,354.

597,056 < 5,741,354

Which is greater, 7,541,240 or 8,640,425?

7,541,240

8,640,425

M

HTh

TTh

Th

H

T

O

7

5

4

1

2

4

0

M

HTh

TTh

Th

H

T

O

8

6

4

0

4

2

5

Compare the millions.

8 is greater than 7.

So, 8,640,425 is greater than 7,541,240.

8,640,425 > 7,541,240 Chapter 1 | 7

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