Workbook Prathomsuksa 3 © 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
BJRC363031_GoGetMaths WB Prelimpage P3.indd 1
885-87220-0351-7 First Published 2022
5/11/2564 BE 12:09
Contents Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Numbers to 100,000
1
Practices Think
Chapter 8
Fractions
114
1
Practices
114
12
Think
131
Money
132
Practices
132
Think
153
Mixed operations
154
Addition and subtraction 13 within 100,000 Practices
13
Think
29
Chapter 9
Chapter 10
Multiplication
30
Practices
154
Practices
30
Think
165
Think
41
Time
166
Chapter 11
Division
42
Practices
166
Practices
42
Think
192
Think
57
Symmetry
193
Chapter 12
Length
58
Practices
193
Practices
58
Think
197
Think
73
Data handling
198
Chapter 13
Mass
74
Practices
198
Practices
74
Think
207
Think
89
Revision 2
208
Volume and capacity
90
Practices
90
Think
106
Revision 1
107
Chapter 1
Numbers up to 100,000
Practice 1
Counting to 100,000
1. Count. Write in Hindu-Arabic numerals and Thai numerals. .g. 1,000
100
1,000
100
10
10
1
100
10
10
1
1,000
100
10
10
1,000
100
10
100
10
๔,๖๘๒
4,682
a 1,000
1,000
100
100
10
1
1
1,000
1,000
100
100
10
1
1
1,000
1,000
100
100
10
1
1
1,000
1,000
100
10
1
1
100
10
1
1,000
9,859
๙,๘๕๙
Chapter 1 | 1
b
10,000
1,000
100
10,000
1,000
100
1,000
100
1
1,000
100
1
100
1
10,000
1,000
100
100
10,000
1,000
100
100
10,000
1,000
100
10,000
1,000
100
10,000
1,000
100
1,000
1
1
10
1
1
1
๕๖,๗๐๑
56,701 d
10
๒๔,๖๒๗
24,627 c
100
10,000 10,000
1,000
1,000
100
100
10
10
1
1
10,000 10,000
1,000
1,000
100
100
10
10
1
1
10,000 10,000
1,000
1,000
100
100
10
1
1
10,000 10,000
1,000
100
100
10
1
1
10,000
1,000
100
10
1
98,979 2 | Mathematics Prathomsuksa 3
๙๘,๙๗๙
2. Write them in numerals. .g.
a
b
c
Two thousand five hundred and ten
2,510
Nine thousand two hundred and fifteen
9,215
Fifty-one thousand three hundred and ninety
51,390
Eighty thousand four hundred and seventy-one
80,471
3. Write the numbers in words. .g.
a
b
c
5,613
Five thousand six hundred and thirteen
6,450
Six thousand four hundred and fifty
16,307
Sixteen thousand three hundred and seven
48,452
Forty-eight thousand four hundred and fifty-two
Chapter 1 | 3
4. Fill in the blanks. .g.
7,458 =
a
4,059 = 4,000 +
50
b
8,000 +
100
+ 80 + 7 = 8,187
c
11,804 =
10,000
+ 1,000 + 800 + 4
d
30,000 +
2,000
+ 400 + 80 + 6 = 32,486
e
43,053
7,000
+ 400 + 50 + 8 +9
= 40,000 + 3,000 + 50 + 3
5. Fill in the blanks. In
78,594,
.g.
the value of the digit 7 is
70,000
.
a
the value of the digit 8 is
8,000
.
b
the value of the digit 5 is
500
.
c
the value of the digit 9 is
90
.
d
the value of the digit 4 is
4
.
7
8
5
9
4
6. Fill in the blanks. 23,841 .g.
The digit
2
is in the ten thousands place. Its value is
a
The digit
8
is in the hundreds place. Its value is
b
The digit
4
is in the tens place. Its value is
c
The digit
3
is in the thousands place. Its value is
d
The digit
1
is in the ones place. Its value is
4 | Mathematics Prathomsuksa 3
20,000 .
800 40
. 3,000
1
.
.
.
Practice 2
Comparing and ordering numbers
1. Fill in the blanks. Compare. .g.
3
Th
H
T
O
3,856
3
8
5
6
5,475
5
4
7
5
5
thousands.
thousands is smaller than 3,856
a
8
is smaller than
5,475
.
Th
H
T
O
4,589
4
5
8
9
4,598
4
5
9
8
tens is smaller than
9
4,598
.
TTh
Th
H
T
O
34,099
3
4
0
9
9
34,098
3
4
0
9
8
4,589
b
9
is smaller than
tens.
ones is greater than 34,099
8
is greater than
ones. 34,098
.
Chapter 1 | 5
2. Mark the numbers on the number line. Fill in the blanks. .g.
Which is smaller, 4,400 and 6,100? 4,400 4,000
5,000
4,400 a
6,100
is smaller than
6,100
.
Which is greater, 8,620 and 8,700? 8,620
8,700
8,600
8,700 b
6,000
8,700
is greater than
8,620
8,800
.
Which is smaller, 12,800 and 11,800? 11,800 11,000
11,800 c
12,800
12,000
is smaller than
12,800
13,000
.
Which is greater, 65,340 and 65,380? 65,340
65,380
65,300
65,380 6 | Mathematics Prathomsuksa 3
65,400
is greater than
65,340
.
3. Shade the greater number. .g.
c
5,980
7,701
14,780
14,870
a
d
7,234
7,277
78,258
7,825
b
4,380
3,470
65,747
65,742
9,748
9,784
84,047
84,470
e
4. Shade the smaller number. .g.
a
12,587
8,575
c
b 3,578
3,577
d 37,845
73,845
e 57,102
56,201
5. Cross the greatest number. Shade the smallest number. .g.
5,890
5,987
8,589
5,789
a
8,740
6,875
6,874
6,478
b
15,658
51,689
47,850
56,870
c
41,520
45,680
40,895
40,859
d
3,578
3,875
5,870
5,875
3,587
e
35,770
35,077
36,890
38,890
35,707
f
65,680
66,870
65,864
66,980
65,064 Chapter 1 | 7