Textbook
Prathomsuksa 1 © 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
BDRC301031_GoGetMaths TB Prelimpage P1.indd 1
885-87220-0346-3 First Published 2022
5/11/2564 BE 12:00
Contents Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Numbers 0 to 10
1
Lesson 1
Counting to 10
2
Lesson 2
Comparing and ordering numbers
6
Lesson 3
Ordinal numbers
10
Lesson 4
Number bonds
12
Addition within 10
14
Lesson 1
Ways to add
15
Lesson 2
Word problems
21
Subtraction within 10
24
Lesson 1
Ways to subtract
25
Lesson 2
Word problems
30
Lesson 3
Addition and subtraction
33
Shapes and patterns
35
Lesson 1
Recognizing 2D shapes
36
Lesson 2
Recognizing 3D shapes
40
Lesson 3
Making patterns with shapes
44
Numbers to 20
46
Lesson 1
Counting to 20
47
Lesson 2
Comparing and ordering numbers
52
Addition and subtraction within 20
57
Lesson 1
Ways to add
58
Lesson 2
Ways to subtract
65
Lesson 3
Finding the unknowns in addition and subtraction
70
Lesson 4
Word problems
76
Chapter 7
Chapter 8
Chapter 9
Chapter 10
Chapter 11
Length
83
Lesson 1
Comparing objects
84
Lesson 2
Measuring length
87
Lesson 3
Comparing and ordering lengths
96
Lesson 4
Word problems
100
Mass
104
Lesson 1
Comparing objects
105
Lesson 2
Measuring mass
108
Lesson 3
Comparing and ordering masses
114
Lesson 4
Word problems
118
Numbers to 100
122
Lesson 1
Counting to 100
123
Lesson 2
Comparing and ordering numbers
128
Lesson 3
Number patterns
135
Addition and subtraction within 100
140
Lesson 1
Ways to add
141
Lesson 2
Ways to subtract
147
Lesson 3
Finding the unknowns in addition and subtraction
153
Lesson 4
Word problems
157
Picture graphs
164
Lesson 1
Reading a picture graph
165
Lesson 2
Solving problems
168
Computational thinking
171
The big idea
Illustrates a scenario through which students can connect to the chapter.
Special Features
Computational thinking
Introduces a new approach for solving complex problems with confidence.
Starting point
Provides questions to initiate thinking and jump-start learning.
Learning to know
Introduces new concepts using the CPA approach with engaging illustrations.
Thinking corner
Challenges students with unconventional questions to develop higher-order thinking skills.
Try this
Provides various exercises to immediately evaluate students’ understanding.
Fun with Maths!
Allows students to explore mathematical concepts actively either as an individual or in groups.
Chapter 1
Numbers 0 to 10
How many children are there? How many balls are there?
Lesson 1
Counting to 10
Lesson 2
Comparing and ordering numbers
Lesson 3
Ordinal numbers
Lesson 4
Number bonds
Lesson 1
Counting to 10
Starting point
Look in your pencil case. How many pencils do you have?
Learning to know
Counting to 10
zero
one
two
three
four
2 | Mathematics Prathomsuksa 1
five
six
seven
eight
nine
ten
Chapter 1 | 3
Work in pairs. 1. Put some cubes on the table. 2. Get your partner to show the correct card that matches the number of cubes. 3. Switch roles and repeat. 4. The one who showed more correct cards wins.
Count. Write the numbers in Hindu-Arabic numerals and words. Write them in Thai numerals too.
4 | Mathematics Prathomsuksa 1
Learning to know
Counting back
Count.
Count on.
10 10 99 88 77 66 55 44 33 22 11 00
Count back.
1. Count back. Write the numbers.
2. Fill in the missing numbers.
8
7
6 Chapter 1 | 5
Lesson 2
Comparing and ordering numbers
Starting point
Get some red cubes. Get some blue cubes. Which is more? Which is less? How do you know?
Learning to know
Matching and comparing
There are 4 dogs.
There are 4 bones. = means ‘equal to‛.
The number of dogs is equal to the number of bones. We can write 4 = 4.
There are 3 cats.
There are 2 fish. = / means ‘not equal to‛.
The number of cats is not equal to the number of fish. We can write 3 ≠ 2. There are more cats than fish. There are fewer fish than cats. 6 | Mathematics Prathomsuksa 1
There are fewer spoons than forks.
Play in groups of three. 1. The first student shows some spoons. 2. The second student shows some forks. 3. The third student matches the spoons and forks, and compares them. 4. Switch roles and repeat.
1. Which two groups have equal number of things?
Group A
Group B
Group C
2. Which group has more things? Group D
Group E
3. Which group has fewer things? Group F
Group G
Chapter 1 | 7