math coursebooks 2a part 1

ACTIVITY BOOK 2nd Edition2APart 1

Explore the world of Shaping Maths with Aini, Bala, Caili and David on their journey to the six fantastic Mathematics islands. At each level, Shaping Maths offers a wide range of learning experiences, taking pupils from the concrete through the pictorial to the abstract mode of mathematical representation. Through clear presentation and a highly structured and spiral approach, the package provides pupils with a strong mathematical foundation and develops higher order thinking skills. Using a thematic approach, pupils are able to connect their everyday life experiences with Mathematics, thus encouraging active pupil participation and learning.

Shaping Maths is an up-to-date instructional package designed to meet the learning needs of pupils from Primary 1 to 6. The Primary 2 package consists of two coursebooks, four activity books, and a teacher’s resource pack.

Shaping Maths makes Mathematics engaging, accessible and fun!

BalaCaili

Aini

David

Shaping Maths Activity Book 2nd Edition 2A2A Par t 1

Sh

ap

ing

Ma

ths

Sh

ap

ing

Ma

ths

Charlotte Collars • Koay Phong Lee • Lee N

gan Hoe • Tan Cheow Seng

Pa

r t 1

AC

TIV

ITY

BO

OK

2n

d E

dit

ion 2

A2

A

Charlotte Collars • Koay Phong Lee • Lee Ngan Hoe • Tan Cheow Seng

SMAB2A_Cover_pt1. 1SMAB2A_Cover_pt1. 1 1/15/08 10:06:54 AM1/15/08 10:06:54 AM

Charlotte Collars • Koay Phong Lee • Lee Ngan Hoe • Tan Cheow Seng (Cert. Ed.) (Ph.D.) (M.Sc.Ed.) (Cert. Ed.)

ACTIVITY BOOK 2nd Edition 2APart 1

•APPROVE

DBY

MINISTRY OF EDUCATION

•

for use from 2007-201

1

© 2007 Marshall Cavendish International (Singapore) Private Limited

Published by Marshall Cavendish Education

An imprint of Marshall Cavendish International (Singapore) Private Limited

A member of Times Publishing Limited

Times Centre, 1 New Industrial Road, Singapore 536196

Customer Service Hotline: (65) 6411 0820

E-mail: [email protected]

Website: www.marshallcavendish.com/education/sg

First published 2007

Second impression 2008

Reprinted 2009

All rights reserved. No part of this publication may be reproduced, stored in

a retrieval system or transmitted, in any form or by any means, electronic,

mechanical, photocopying, recording or otherwise, without the prior

permission of the copyright owner.

ISBN 978-981-01-6528-4

Edited by: Goh Jia Zhan and Yee Pey Ling

Designed by: Henny Irawati

Cover design by: Winnie Ng

Printed in Singapore by C.O.S. Printers Pte Ltd

©981-01-6528-4.indd 1©981-01-6528-4.indd 1 1/11/08 5:29:56 PM1/11/08 5:29:56 PM

Let’s Find Out

PREFACE

Shaping Maths is an instructional package written according to the latest Primary Mathematics Syllabus provided by the Ministry of Education, Singapore. The package is designed to meet the learning needs of pupils from Primary 1 to 6. For Primary 2, the package consists of two coursebooks, four activity books and a teacher’s resource pack.

Continuing research in education has resulted in the introduction of new features in the second edition. Through these features, educators are further equipped with various strategies in addressing teaching and learning needs. These features also include more open-ended questions to encourage exploration and in-depth thinking among pupils. Thus, mathematically inquisitive learners are born!

Features

Question Classifi cation – pre-requisite skills

– reinforcement of current concepts

– higher-order thinking skills

Helps teachers to spend their time more effectively by using the appropriate questions to get pupils to master the necessary skills.

Let’s Find Out

Engages pupils in mathematical self-discovery or investigation that promotes mathematical thinking.

My Maths Journal

Contains refl ection worksheets to develop pupils into self-regulated learners.

Softdrinks

Review 2

Review Exercises

Helps pupils to consolidate their learning.

82

My Maths Journal

My FavouriteMathematics Activity This Term

Write about the activity.

Draw to show the activity.

O ENTC NT S

1 Numbers to 1000

Looking Back − Tens and Ones Activity 1 1 Looking Back − Counting by Tens and Ones Activity 2 3 Counting Beyond 100 Activity 3 5 Hundreds, Tens and Ones Activity 4 9 Comparing and Ordering Numbers Activity 5 13 Activity 6 15Let’s Find Out 17

2 Addition and Subtraction Within 1000

Meanings of Addition and Subtraction Activity 1 18 Addition Without Renaming Activity 2 21 Activity 3 23 Subtraction Without Renaming Activity 4 24 Activity 5 26 Addition With Renaming (1) Activity 6 27 Activity 7 29 Addition With Renaming (2) Activity 8 30 Activity 9 32 Subtraction With Renaming (1) Activity 10 34 Activity 11 36 Subtraction With Renaming (2) Activity 12 37 Activity 13 39

Solving Two-step Word Problems Activity 14 40 Let’s Find Out 42

3 Length

Measuring Length in Metres Activity 1 43 Measuring Length in Centimetres Activity 2 45 Activity 3 47 Solving Word Problems Activity 4 50Let’s Find Out 53

Review 1 54

My Maths Journal 67

SMAB2A_Content_pt1 1SMAB2A_Content_pt1 1 3/30/07 11:11:16 AM3/30/07 11:11:16 AM

Colour the correct number of squares. Then fi ll in the missing numbers. a) b)

43 is 40 and . 33 is and 3.

1

Activity 1Unit 1

11 Numbers to 1000: Looking Back – Tens and Ones

Count the tens and ones. Then fi ll in the missing numbers. a) b)

tens ones = tens ones =

2

2 8 28 6 0 60

3 30

2 1 Numbers to 1000: Looking Back – Tens and Ones

Write the numbers in words. Look at the example below. a) b)

7 7050 2

fifty-two

c) d)

Write in numbers. Look at the example below. a) b)

65

9 ones8 tens5 ones6 tens

0 ones9 tens 10 tens 0 ones

3

4

c) d)

80 60 40

89

10090

seventy-seven

eight-sixforty

SMAB2A_01_pt1. 2 10/23/06 11:07:59 AM

31 Numbers to 1000: Looking Back – Counting by Tens and Ones

Complete the number line.

a) 10 more than 47 is . 47 + 10 =

b) 10 less than 47 is . 47 – 10 =

7 17 27 67

a) 1 more than 35 is . 35 + 1 =

b) 1 less than 35 is . 35 – 1 =

1

2

Activity 2Unit 1

Complete these sentences.

36 36

34 34

37 47 57

57 57

37 37

SMAB2A_01_pt1. 3 10/23/06 11:08:09 AM

4 1 Numbers to 1000: Looking Back – Counting by Tens and Ones

Fill in the missing numbers. Look at the examples below.

a)

b)

Circle the correct answers. Look at the example below.

3

4

1 more

10 less 10 more

1 less

54

55

1 more

10 less 10 more

1 less

80 90

a) b)

c) d) – 1 100 99 – 10

+ 1 63 73 + 10

– 1 40 30 – 10

+ 1 27 28 + 10

56

45 65

81

70

79

SMAB2A_01_pt1. 4 10/23/06 11:08:11 AM

51 Numbers to 1000: Counting Beyond 100

Count and write the number in the box. Then write the number in words. a)

b)

c)

1

Activity 3Unit 1

603 six hundred and three

460 four hundred and sixty

245 two hundred and forty-fi ve

6 1 Numbers to 1000: Counting Beyond 100

422

700

819

a b

2

a) 100 more than 354 is .

b) 100 less than 354 is .

3 a) What number is 100 less than the given number? b) What number is 100 more than the given number?

100 less 100 more

454

254

322 522

600 800

719 919

SMAB2A_01_pt1. 6 10/23/06 11:08:15 AM

71 Numbers to 1000: Counting Beyond 100

a) Start at 216. Count on in tens. Colour the trail of tens in red.

b) Start at 855. Count backwards in hundreds. Colour the trail of hundreds in blue.

845 835 795 805

855 755 825 815 155

320 655 400 255

220 516 555 455 355

219 416 236 246 256

218 316 226 136 266

217 216 116 156 276

196 176 286

B

A

c) Which mouse gets the cheese? Mouse

Which mouse reaches the mouse trap? Mouse

4

B

A

SMAB2A_01_pt1. 7 10/23/06 11:08:17 AM

8 1 Numbers to 1000: Counting Beyond 100

Study the number line below.

a) What number is 1 more than 203?

b) What number is 10 less than 203?

5

190 200203

6

868268 768568

Study each number pattern and fill in the next two numbers.

a) 88 188 288

b) 476 486 496

c) 760 750 740

d) 232 231 230

7

a) Complete the number line below.

b) What number is 100 more than 568?

c) What number is 100 less than 568?

204

193

368 468 668

668

468

388 488

506 516

730 720

229 228

SMAB2A_01_pt1. 8 10/23/06 11:08:19 AM

91 Numbers to 1000: Hundreds, Tens and

Count the hundreds, tens and ones. Then fi ll in the missing numbers. a)

hundreds tens ones =

b)


c)


1

Activity 4Unit 1

3 2 3 323

6 4 0 640

7 0 7 707

SMAB2A_01_pt1. 9 10/23/06 11:08:23 AM

10 1 Numbers to 1000: Hundreds, Tens and

Match.

916 •

• Six hundred and nineteen

169 •

• Six hundred and ninety

619 •

• One hundred and sixty-nine

690 •

• Nine hundred and sixty-one

961 •

2

SMAB2A_01_pt1. 10 10/23/06 11:08:26 AM

111 Numbers to 1000: Hundreds, Tens and

3 Write the numbers in words.

411

505

838

4 Fill in the blanks.

a) In 358, the digit is in the ones place.

b) In 672, the digit is in the hundreds place.

c) In 834, the digit is in the tens place.

d) In 980, the digit is in the ones place.

four hundred and eleven

five hundred and five

eight hundred and thirty-eight

8

6

3

0

SMAB2A_01_pt1. 11 10/23/06 11:08:30 AM

12 1 Numbers to 1000: Hundreds, Tens and

5 Fill in the missing numbers. a) b)

213 327

200 + 10 + 300 + + 7

c) d)

449 580

+ 40 + 9 500 +

e) f) hundreds tens ones

600 + 30 + 8 700 + 40 + 6

g) h) hundreds hundreds tens tens ones ones

800 + 50 900 + 2

3 20

400 80

638746

850

902

SMAB2A_01_pt1. 12 10/23/06 11:08:33 AM

131 Numbers to 1000: Comparing and Ordering Numbers

1

a) What number does each picture show?

b) Which number is smaller?

2

a) What number does each picture show?

b) Which number is greater?

What number does each picture show?

Activity 5Unit 1

353

333

353

240

153

153

SMAB2A_01_pt1. 13 10/23/06 11:08:38 AM

14 1 Numbers to 1000: Comparing and Ordering Numbers

3 a) Write the correct answers in the boxes.

4

597 = hundreds tens ones



b) Which number is the smallest?

c) Which number is the greatest?

Arrange these numbers in order. Begin with the greatest number.

437 409 432

5 Arrange these numbers in order. Begin with the smallest number.

308 298 306 275

greatest

smallest

5 9 7

4 1 9

5 0 8

419

597

437 432 409

275 298 306 308

SMAB2A_01_pt1. 14 10/23/06 11:08:40 AM

151 Numbers to 1000: Comparing and Ordering Numbers

Hundreds Tens Ones

An example ➞ 1 6 8

You are given three cards:

a) Use these cards to form numbers between 100 and 1000. List all the possible numbers in the table below.

1 6 8

1

b) i) Which two numbers have the greatest hundreds?

ii) Between these two numbers, which is greater?

c) i) Which two numbers have the smallest hundreds?

ii) Between these two numbers, which is smaller?

d) Arrange the numbers listed in a) in order. Begin with the smallest number.

Activity 6Unit 1

1 8 6

6 1 8

6 8 1

8 1 6

8 6 1

816, 861

861

168, 186

168

168, 186, 618, 681, 816, 861

SMAB2A_01_pt1. 15 10/23/06 11:08:42 AM

16 1 Numbers to 1000: Comparing and Ordering Numbers

You are given three cards. a) Write any number from 1 to 9 on the second and third

cards.

b) Use these three cards to form numbers between 100 and 1000.

i) What is the greatest 3-digit number formed?

ii) What is the smallest 3-digit number formed?

0

2

You are given four cards.

Use three of these cards to form numbers between 100 and 1000.

a) What is the greatest 3-digit number formed?

b) What is the smallest 3-digit number formed?

3

8 6 9 9

Answer varies

998

689

Answer varies

Answer varies

SMAB2A_01_pt1. 16 10/23/06 11:08:43 AM

171 Numbers to 1000: Let’s Find Out

Let’s Find Out

Number Riddle

2

I shall fi nd the answer by working backwards.

What is the tens digit?

What is the hundreds digit?

I am thinking of a 3-digit number.

I can get the hundreds digit by adding the tens digit and the ones digit.

The tens digit is 2 more than the ones digit.

The ones digit is 2.

What is the number that I am thinking of?

6 4

SMAB2A_01_pt1. 17 10/23/06 11:08:45 AM

18 2 Addition and Subtraction Within 1000: Meanings of Addition and Subtraction

part

whole

part

29

20

9

part

whole

part

57

50

7

Fill in the missing number.

a) 20 + 9 =

9 + 20 =

29 – 9 =

29 – 20 =

9 more than 20 is .

is 9 less than 29.

b) 50 + 7 =

7 + 50 =

57 – 50 =

57 – 7 =

7 more than 50 is .

is 7 less than 57.

1

Activity 1Unit 2

29

29

20

9

29

20

57

57

7

50

50

57

SMAB2A_02_pt1..indd 18 10/23/06 11:59:45 AM

192 Addition and Subtraction Within 1000: Meanings of Addition and Subtraction

part

whole

part

50

40

10

c)

40 + 10 =

10 + 40 =

50 – 40 =

50 – 10 =

10 more than 40 is .

is 10 less than 50.

2 Put ✓ next to the number sentence which matches the story.

a) Mrs Muthu made 20 apple pies and 15 meat pies. How many pies did she make altogether?

20 + 15 = 35

20 – 15 = 5

Mrs Muthu made pies altogether.

Activity 150

50

10

40

50

40

35

SMAB2A_02_pt1..indd 19 10/23/06 11:59:46 AM

20 2 Addition and Subtraction Within 1000: Meanings of Addition and Subtraction

d) Aimin paid $25 for a dress. She had $24 left. How much money had she at first?

$25 + $24 = $49

$25 – $24 = $1

She had $ at first.

b) Ali has 46 bookmarks. He gives 12 bookmarks to his friend. How many bookmarks has he left?

46 + 12 = 58

46 – 12 = 34

Ali has bookmarks left.

c) Lin used 57 blue ribbons and 25 red ribbons. How many more blue ribbons than red ribbons did

she use?

57 + 25 = 82

57 – 25 = 32

Lin used more blue ribbons than red ribbons.

34

32

49

SMAB2A_02_pt1..indd 20 10/23/06 11:59:47 AM

212 Addition and Subtraction Within 1000: Addition Without Renaming

43 + 156 = 106 + 82 =

4 3+ 1 5 6

1 0 6+ 8 2

30 + 431 = 215 + 763 =

+ +

1

2

63 + 120 =

6 3 + 1 2 0

Activity 2Unit 2

183

1 8 3

1 9 9 1 8 8

4 6 1 9 7 8

4 3 1 7 6 3 3 0 2 1 5

199 188

461 978

SMAB2A_02_pt1..indd 21 10/23/06 11:59:50 AM

22 2 Addition and Subtraction Within 1000: Addition Without Renaming

Mars

Jupiter

Neptune

Saturn

3 a) Work out all the answers. Then colour the boxes where the answer is 568.

b) Bala travelled along the path formed by the coloured boxes.

Which planet did he land on?

5 5 2+ 1 6

5 6 8

1 6 3+ 4 2 4

2 5 7+ 2 4 2

5 0 5+ 6 3

2 2 3+ 3 4 5

3 3 1+ 2 3 7

3 8+ 5 4 0

3 6 4+ 1 0 4

4 4 1+ 1 2 8

5 6 8 5 7 8

5 6 8 4 6 85 8 7

5 6 8 5 6 94 9 9

Neptune

SMAB2A_02_pt1..indd 22 10/23/06 11:59:52 AM

232 Addition and Subtraction Within 1000: Addition Without Renaming

1

3

2

Mrs Chen sold 150 buns in the afternoon. She sold 127 buns in the evening. How many buns did she sell altogether?

150 + 127 =

She sold buns altogether.

Devi has 214 beads. Her sister has 45 more beads than her. How many beads does Devi’s sister have?

Devi’s sister has beads.

Mr Lim spent $343. He had $125 left. How much money did he have at fi rst?

He had $ at fi rst.

1 5 0+ 1 2 7

Activity 3Unit 2

277

277

2 7 7

259

468

SMAB2A_02_pt1..indd 23 10/23/06 11:59:54 AM

24 2 Addition and Subtraction Within 1000: Subtraction Without Renaming

1 358 – 125 =

3 5 8 – 1 2 5

2189 – 36 = 358 – 240 =

1 8 9– 3 6

3 5 8– 2 4 0

879 – 259 = 909 – 403 =

– –

Activity 4Unit 2

233

2 3 3

153 118

1 5 3 1 1 8

6 2 0 5 0 6

2 5 9 4 0 38 7 9 9 0 9

620 506

252 Addition and Subtraction Within 1000: Subtraction Without Renaming

Greenland

China

MaliMalaysia

3 a) Work out all the answers. Then colour the boxes where the answer is 34.

b) Bala travelled along the path formed by the coloured boxes. Where did he land?

1 9 4– 1 6 0

3 4

1 6 8– 1 3 3

2 4 4– 1 1 0

1 7 6– 1 4 2

6 8 9– 6 5 5

3 3 9– 3 0 5

2 5 8– 3 4

8 8 9– 7 6 4

4 3 5– 4 0 1

3 4 2 2 4

3 4 1 2 5 3 5

3 4 3 41 3 4

Malaysia

26 2 Addition and Subtraction Within 1000: Subtraction Without Renaming

There were 476 people at a concert. 250 of them were adults. How many children were there?

476 – 250 =

There were children.

David has 168 toy soldiers. Tom has 58 fewer toy soldiers than David. How many toy soldiers does Tom have?

Tom has toy soldiers.

Sally went shopping with $478. She bought a handbag and had $264 left. How much did she pay for the handbag?

She paid $ for the handbag.

1

4 7 6– 2 5 0

2

3

Activity 5Unit 2

226

226

2 2 6

110

214

SMAB2A_02_pt1..indd 26 10/23/06 12:00:02 PM

272 Addition and Subtraction Within 1000: Addition With Renaming (1)

67 + 125 = 159 + 70 =

138 + 245 = 654 + 155 =

1 266 + 153 =

2 6 6+ 1 5 3

6 7+ 1 2 5

2

+

1 5 9+ 7 0

+

Activity 6Unit 2

419

4 1 9

1 9 2 2 2 9

8 0 9

192 229

383 809

3 8 3

2 4 51 3 8

1 5 56 5 4

SMAB2A_02_pt1..indd 27 10/23/06 12:00:08 PM

28 2 Addition and Subtraction Within 1000: Addition With Renaming (1)

Mark these addition sums.

Put ✓ in the box if the answer is correct.

Put ✗ in the box if the answer is wrong. Then show the correct way of adding.

Sum How you Correct answer should add

a) 178 + 14 =

b) 252 + 18 =

c) 658 + 129 =

d) 537 + 56 =

e) 648 + 190 =

3

1 7 8+ 1 4

1 8 2

1 7 8+ 1 4

2 5 2+ 1 8

2 7 0

2 5 2+ 1 8

6 5 8+ 1 2 9

7 7 7

6 5 8+ 1 2 9

5 3 7+ 5 6

6 9 3

5 3 7+ 5 6

6 4 8+ 1 9 0

8 4 8

6 4 8+ 1 9 0

1 9 2

7 8 7

5 9 3

8 3 8

192

787

593

838

SMAB2A_02_pt1..indd 28 10/23/06 12:00:09 PM


Mr Wu delivered 158 letters in the morning. He delivered 90 letters in the afternoon. How many letters did he deliver altogether?

158 + 90 =

He delivered letters altogether.

Osman has 452 postcards. Aminah has 97 more postcards than Osman. How many postcards does Aminah have?

Aminah has postcards.

247 women and 148 men work in a factory. How many workers are there in the factory?

There are workers in the factory.

1 5 8+ 9 0

3

2

1

Activity 7Unit 2

248

248

2 4 8

549

395

SMAB2A_02_pt1..indd 29 10/23/06 12:00:11 PM


87 + 635 = 246 + 575 =

8 7+ 6 3 5

2 4 6+ 5 7 5

528 + 96 = 398 + 409 =

+ +

1 177 + 254 =

1 7 7+ 2 5 4

2

Activity 8Unit 2

431

4 3 1

722 821

7 2 2 8 2 1

6 2 4 8 0 7

9 6 4 0 95 2 8 3 8 9

624 807

SMAB2A_02_pt1..indd 30 10/23/06 12:00:15 PM


a) Add.

3 0 4+ 3 9 6

5 3 6+ 2 8 7

6 5 9+ 2 5 4

4 3 5+ 3 6 7

5 6 4+ 2 6 9

3 8 4+ 3 6 6

700keep

650tidy 833

and

903room 750

clean733or

802green

823our

913country

805neat

3

b) Help Mr Froggie cross the pond by colouring the leaves that match the answers above.

c) Write down the message given on the coloured leaves.

7 0 0

8 0 2

8 2 3

8 3 3

9 1 3

7 5 0

Keep our country clean and green. or Keep our country green and clean.

SMAB2A_02_pt1..indd 31 10/23/06 12:00:20 PM


1

2

3

Mr Hamid bought a watch and a pair of shoes. How much did he spend altogether?

$368 + $158 =

He spent $ altogether.

An oven costs $197 more than a toaster. What is the cost of the oven?

The cost of the oven is $ .

Leo saved $346. Jenny saved $185 more than Leo. How much money did Jenny save?

Jenny saved $ .

3 6 8+ 1 5 8

Activity 9Unit 2

526

526

5 2 6

305

531

SMAB2A_02_pt1..indd 32 10/23/06 12:00:22 PM


Bala had some stamps. He gave 159 stamps to David. He has 279 stamps left. How many stamps did Bala have at first?

Bala had stamps at first.

Mrs Wang needs 350 blue beads, 265 red beads and 125 yellow beads to make a bag. How many beads does she need altogether?

She needs beads altogether.

Mr Soon had $112 left after buying a leather bag and a wallet. How much money did he have at first?

He had $ at first.

$325

$85

4

3 5 02 6 5

+ 1 2 5

6

5

438

7 4 0

740

522

SMAB2A_02_pt1..indd 33 10/23/06 12:00:24 PM

34 2 Addition and Subtraction Within 1000: Subtraction With Renaming (1)

294 − 118 = 518 − 126 =

754 − 136 = 570 − 316 =

1 416 – 233 =

4 1 6– 2 3 3

2 Subtract.

2 9 4– 1 1 8

5 1 8– 1 2 6

Activity 10Unit 2

–

–

183

1 8 3

176 392

1 7 6

6 1 8 2 5 4

1 3 6 3 1 67 5 4 5 7 0

618 254

3 9 2

SMAB2A_02_pt1..indd 34 10/23/06 12:00:27 PM

352 Addition and Subtraction Within 1000: Subtraction With Renaming (1)

6 4

5–

1 9

07

8 1

– 5

2 8

8 5

8–

6 6

66

7 9

– 2

8 1

9 1

6–

4 2

5

8 6

7–

3 7

6

5 6

2–

1 2

3

8 4

0–

4 1

8

B

O

U

Z

L

A

E

R

D

42

2 19

2 43

9 15

1 49

1 13

7 25

3 45

5 39

8

8 3

2–

6 8

1

3 U

se t

he c

odes

at

the

botto

m o

f th

e pa

ge t

o so

lve

this

rid

dle:

“Wha

t do

you

cal

l a s

leep

ing

bull?

”7

13

8 6

– 2

4 9

1 3

7

A

B

U

LL

D

O

1 5

1

ZE

R

4 2

2

4 3

9

4 9

14

9 1

3 9

8

1 9

2

2 5

34

5 5

SMAB2A_02_pt1..indd 35 10/23/06 12:00:28 PM


There are 193 mangoes in a basket. 25 of them are green. How many mangoes are not green?

193 – 25 =

mangoes are not green.

Roy collected 250 phonecards. Helen collected 38 fewer phonecards than Roy. How many phonecards did Helen collect?

Helen collected phonecards.

Meimei went shopping with $215. She spent $194. How much money did she have left?

She had $ left.

1 9 3– 2 5

1

2

3

Activity 11Unit 2

168

168

1 6 8

212

21

250 – 38 = 212

$215 – $194 = $21

SMAB2A_02_pt1..indd 36 10/23/06 12:00:30 PM


1 215 – 186 =

2 1 5– 1 8 6

314 − 68 = 460 − 297 =

657 − 268 = 703 − 425 =

2 Subtract.

3 1 4– 6 8

4 6 0– 2 9 7

Activity 12Unit 2

–

–

29

2 9

246 163

3 8 9 2 7 8

2 6 8 4 2 56 5 7 7 0 3

278389

2 4 6 1 6 3

SMAB2A_02_pt1..indd 37 10/23/06 12:00:33 PM


7 0

0–

3 2

5

6 2

1–

5 2

37

2 2

– 2

6 9

L

O

N

P

V

E

98

10

9 17

8 37

5 45

3 75

6

9 0

0–

1 4

4

3

5 0

7–

3 9

8

U

se t

he c

odes

at

the

botto

m o

f th

e pa

ge t

o so

lve

this

rid

dle:

“Wha

t is

an

8-le

tter

wor

d th

at h

as o

nly

1 le

tter

in it

?”

9 2

5–

1 6

9

9 4

1–

1 8

5

8 2

1–

6 4

3E

N

VE

L

OP

E

7 5

6

1 7

8

4 5

3

3 7

5

7 5

6

9 8

1 0

9

7 5

6

SMAB2A_02_pt1..indd 38 10/23/06 12:00:34 PM


1

2

3

On Saturday, 353 people visited a food stall. On Sunday, 421 people visited the same stall. How many more people visited the stall on Sunday than on Saturday?

421 – 353 =

more people visited the stall on Sunday than on Saturday.

Hassan sold 532 sticks of chicken satay. He sold 155 fewer sticks of mutton satay. How many sticks of mutton satay did he sell?

He sold sticks of mutton satay.

There were 420 guests at a grand dinner. 245 of the guests wore ties. How many guests did not wear ties?

guests did not wear ties.

4 2 1– 3 5 3

Activity 13Unit 2

68

377

175

6 868

532 – 155 = 377

420 – 245 = 175

SMAB2A_02_pt1..indd 39 10/23/06 12:00:35 PM

40 2 Addition and Subtraction Within 1000: Solving Two-step Problems

1

2

Mr Salleh paid $688 for a watch. He paid $520 less for a tie-pin than the watch. a) How much did he pay for the tie-pin? b) How much did he pay altogether for the watch and

the tie-pin?

a) He paid $ for the tie-pin.

b) He paid $ altogether.

Mr Lee used 135 m of cloth to make curtains. He used 67 m more to make cushion covers than the curtains. a) How much cloth did he use to make cushion

covers? b) How much cloth did he use altogether to make

curtains and cushion covers?

a) He used m of cloth to make cushion covers.

b) He used m of cloth altogether.

Activity 14Unit 2

168

856

202

337

(a) $688 – $520 = $168

(b) $688 + $168 = $856

(a) 135 + 67 = 202

(b) 135 + 202 = 337

SMAB2A_02_pt1..indd 40 10/23/06 12:00:37 PM

412 Addition and Subtraction Within 1000: Solving Two-step Problems

346 men, 264 women and 135 children took part in a fancy dress parade.

a) How many adults took part? b) How many fewer children than adults took part?

a) adults took part.

b) fewer children than adults took part.

Tom, Ali and Lam are bakers. Tom used 275 kg of flour this week. Ali used 18 kg less flour than Tom. Lam used 35 kg more flour than Tom. a) How much flour did Ali use? b) How much flour did Lam use?

a) Ali used kg of flour.

b) Lam used kg of flour.

4

3

610

475

257

310

(a) 346 + 264 = 610 (b) 610 – 135 = 475

(a) 275 – 18 = 257 (b) 275 + 35 = 310

SMAB2A_02_pt1..indd 41 10/23/06 12:00:38 PM

42 2 Addition and Subtraction Within 1000: Let’s Find Out

2

1

Let’s Find Out

Faulty Calculator When we add 345 and 123 using a calculator:

Press 3 4 5 + 1 2 3 = .

What answer does the calculator show?

345 + 123 =

Bala has a faulty calculator.

The 4 and 7 keys of his calculator cannot work.

a) To add 345 and 123, Bala presses

3 3 5 + 1 0 + 1 2 3 =

Will he get the correct answer for ‘345 + 123’? Why?

b) Which buttons of the calculator should Bala press to fi nd the value of ‘709 – 253’? Show two possible ways by fi lling in the boxes below.

468

Yes. 335 + 10 + 123 = 468

8 0 9 − 1 0 0 − 2 5 3 =

8 0 9 − 3 5 3 =

SMAB2A_02_pt1..indd 42 10/23/06 12:00:40 PM

433 Length: Measuring Length in Metres

a) Use glue to join two open pages of old newspapers together.

Place a metre ruler at the edge like this.

b) Draw a strip 1 m long and cut it out using a pair of scissors.

c) With your classmates, line the 1-m strips end-to-end along the length of the classroom to measure how long it is.

The length of my classroom is about m.

d) Now put the strips on the fl oor along the corridor to fi nd its length.

The length of the corridor is about m.

1 m

length of classroom

1

metreruler

Activity 1Unit 3

Answer varies

Answer varies

SMAB2A_03_pt1.indd 43 10/23/06 12:11:49 PM

44 3 Length: Measuring Length in Metres

Guess Check

More than Less than More than Less than 1 m 1 m 1 m 1 m

Work with a partner. First guess the answers. Then check your answers using a metre ruler or a 1-m string. Put ✓ in the correct boxes.

2

My height

My arm’s length

My waistline

Answers vary

Answers vary

Answers vary

453 Length: Measuring Length in Centimetres

Fill in the blanks.

a) Ribbon A is cm long.

b) Ribbon B is cm long.

c) Ribbon C is as long as Ribbon .

d) Ribbon D is cm shorter than Ribbon A.

e) Ribbon is the shortest.

f) Ribbon is the longest.

0 1 2 3 4 5 6 7 8 9 10 cm

A

B

C

D

1

Activity 2Unit 3

7

6

B

2

D

A

SMAB2A_03_pt1.indd 45 10/23/06 12:11:53 PM

46 3 Length: Measuring Length in Centimetres

Stapler: about cm

Pencil case: about cm

SHAPINGMATHS

a) Use a ruler to measure the length and breadth of this bookmark.

length: cm

breadth: cm

b) The breadth of the bookmark is cm shorter than the length.

Paper clip: about cm

Collect these things. Measure their lengths using a ruler.

3

2

10

3

7

Answer varies

Answer varies

Answer varies

SMAB2A_03_pt1.indd 46 10/23/06 12:11:59 PM


a) Estimate and then measure the length of each line.

A B

G

H

C D

E

F

b) Fill in the blanks.

Line is as long as Line .

Line EF is longer than Line CD by cm.

Line Estimate Actual

AB

CD

EF

GH

1 Estimate and then measure the length of

Activity 3Unit 3

Answer varies 5 cm

10 cm

11 cm

10 cm

CD GH

1

Answer varies

Answer varies

Answer varies

SMAB2A_03_pt1.indd 47 10/23/06 12:12:01 PM

48 3 Length: Measuring Length in Centimetres

How long is each of these lines? Measure them using a string and a ruler. a)

Line KL is cm long.

b)

Line MN is cm long.

c) Line is longer than Line .

d) Line is shorter than Line .

K L

N

M

a) Draw a straight line PQ 7 cm long.

b) Draw a straight line RS 2 cm longer than Line PQ.

a) Draw a straight line WX 14 cm long.

b) Draw a straight line YZ 4 cm shorter than Line WX.

4

3

2

10

9

MN KL

KL MN

P Q

R S

W X

Y Z

SMAB2A_03_pt1.indd 48 10/23/06 12:12:03 PM


Fill in the blanks with cm or m. a) The height of our school flagpole

is about 5 .

5

e) I walk about 50 from my school to the nearest bus-stop every day.

d) I am about 10 shorter than my sister.

c) The height of my water bottle is

about 20 .

b) The length of my thumb is

about 3 .

m

cm

cm

cm

m

SMAB2A_03_pt1.indd 49 10/23/06 12:12:04 PM

50 3 Length: Solving Word Problems

The grey belt is 78 cm long. The black belt is 85 cm long. How much shorter is the grey belt than the black belt?

85 – 78 =

The grey belt is cm shorter than the black belt.

Aini’s bear is 18 cm tall. Caili’s bear is 15 cm taller than Aini’s. How tall is Caili’s bear?

18 + 15 =

Caili’s bear is cm tall.

1 8+ 1 5

8 5– 7 8

15 cm

18 cm

?

Aini’s bear Caili’s bear

2

1

?78 cm

85 cm

Activity 4Unit 3

33

33

7

7

3 3

7

SMAB2A_03_pt1.indd 50 10/23/06 12:12:07 PM

513 Length: Solving Word Problems

David uses two strings to tie a parcel. The first string is 28 cm long. The second string is 35 cm long. What is the total length of the two strings?

The total length of the two strings is

cm.

Mr Hari bought a rope 150 m long. He used 95 m of it to fence his garden. What was the length of rope left?

The length of rope left was m.

4

3

63

55

28 + 35 = 63

150 – 95 = 55

SMAB2A_03_pt1.indd 51 10/23/06 12:12:07 PM

52 3 Length: Solving Word Problems

Mrs Li used 168 m of cloth to make school uniforms. She had 32 m of cloth left. How much cloth did she have at first?

She had m of cloth at first.

5

Three flags, A, B and C are placed along a straight line. The distance between Flag B and Flag C is 28 m.

The distance between Flag A and Flag B is 30 m longer than that between Flag B and Flag C.

What is the distance between Flag A and Flag C?

The distance between Flag A and

Flag C is m.

6

A B C

200

86

168 + 32 = 200

28 + 30 = 58 58 + 28 = 86

SMAB2A_03_pt1.indd 52 10/23/06 12:12:08 PM

533 Length: Let’s Find Out

Goldilocks and the Three BearsGoldilocks enters the bedroom of the three bears. She fi nds three beds.

The length of the longest bed is 180 cm. Mother Bear’s bed is 30 cm shorter than Father Bear’s bed and 50 cm longer than Baby Bear’s bed.

a) How long is Mother Bear’s bed?

b) How long is Baby Bear’s bed?

c) Goldilocks is 160 cm tall. Which bed fi ts her best? Why?

Let’s Find OutLet’s Find OutLet’s Find Out

150 cm

100 cm

Father Bear’s bed

SMAB2A_03_pt1.indd 53 10/23/06 12:12:09 PM

54 Review 1

Count the tens and ones. Then fi ll in the missing numbers.

1

tens ones =

a)

tens ones =

b)

tens ones =

c)

Review 1Review 1

4 5 45

5 6 56

6 0 60

55Review 1

In 496, the digit

a) is in the ones place. b) is in the tens place. c) is in the hundreds place.

4

Fill in the missing numbers.

a) 1 more than 54 is . b) 10 more than 68 is .

c) 1 less than 45 is . d) 10 less than 93 is .

2

b) Write the numbers in words.

69

Forty-five

Thirty-two

3

87

a) Write the numbers.

55

78

44

83

32

45

Sixty-nine

Eighty-seven

6

9

4

56 Review 1


a) 100 more than 123 is . b) 100 less than 635 is . c) 100 less than 656 is . d) 100 more than 379 is .

Study each number pattern and fill in the missing numbers.


a) 400 + 20 + 5 = b) 600 + + 1 = 681 c) 900 + 90 + 9 = d) 200 + + 3 = 253

e) + 60 + 5 = 765

7

6

5

b) 332 432 532

a) 67 77 87

c) 384 374 364

d) 429 427 425

223

535

556

479

97 107

132 232

354 344

428 426

425

80

999

50

700

57Review 1

Write the numbers.

a) Three hundred and five

b) Five hundred and twenty-four

c) Seven hundred and fifty-nine

d) Eight hundred and sixty-one

10

9

8

a) Arrange these numbers in order. Begin with the smallest number.

506 500 539 521

smallest

Write the numbers in words.

308a)

b)

c)

d)

530

648

819

305

524

759

861

Three hundred and eight

Five hundred and thirty

Six hundred and forty-eight

Eight hundred and nineteen

500 506 521 539

58 Review 1

b) Arrange these numbers in order. Begin with the greatest number.

708 718 780 735

greatest

11

12 Fill in the missing numbers.

Arrange these three cards 2 1 3 to form:

a) the greatest 3-digit number

b) the smallest 3-digit number

87

80

7

80 + 7 =

87 – 7 =

7 + 80 =

87 – 80 =

7 more than 80 is .

7 less than 87 is .

780 735 718 708

3 2 1

1 2 3

87

80

87

7

87

80

59Review 1

Add.

a) 204 + 75 = b) 342 + 257 =

13

2 0 4 + 7 5

3 4 2 + 2 5 7

c) 654 + 18 = d) 357 + 64 =

6 5 4 + 1 8

3 5 7 + 6 4

e) 284 + 179 = f) 67 + 598 =

+

+

g) 719 + 185 = h) 138 + 262 =

+

+

4 6 3

1 7 92 8 4

463

2 7 9

279

5 9 9

599

6 7 2

672

4 2 1

421

6 6 5

5 9 8 6 7

665

9 0 4

1 8 57 1 9

904

4 0 0

2 6 21 3 8

400

60 Review 1

Subtract.

a) 198 – 52 = b) 364 – 143 =

14

1 9 8 – 5 2

3 6 4 – 1 4 3

c) 560 – 234 = d) 735 – 307 =

5 6 0 – 2 3 4

7 3 5 – 3 0 7

e) 613 – 264 = f) 750 – 268 =

–

–

g) 832 – 748 = h) 400 – 265 =

–

–

2 6 46 1 3

349

146 221

326 428

482

8 4

7 4 88 3 2

84

1 3 5

2 6 54 0 0

135

2 6 87 5 0

1 4 6 2 2 1

3 2 6 4 2 8

3 4 9 4 8 2

61Review 1

a) 345 + 123 + 66 =

b) 45 + 236 + 459 =

Add.15

16

17 524 people were at the school carnival. 452 of them were children. The rest were adults. How many adults were there?

There were adults.

After spending $175 on a watch, Julie was left with $90. How much money did she have at first?

She had $ at first.

3 4 5 1 2 3 + 6 6

4 5 2 3 6 + 4 5 9

534

740

265

72

5 3 4

7 4 0

$175 + $90 = $265

524 – 452 = 72

62 Review 1

18

19

Jane has 162 stickers. Meiling has 58 more stickers than Jane. How many stickers does Meiling have?

Meiling has stickers.

Mr Lin has $510. He spends $387 on a printer. How much money does he have left?

He has $ left.

20 There are 528 Primary Two pupils in the school. There are 164 more Primary Two pupils than Primary One pupils. How many Primary One pupils are there?

There are Primary One pupils.

220

123

364

162 + 58 = 220

$510 – $387 = $123

528 – 164 = 364

63Review 1

21 There were 256 boys, 224 girls and 85 adults at a concert. a) How many children were there at the concert? b) How many more children than adults were there?

a) There were children at the concert.

b) There were more children than adults.

22 Fatimah prepared 370 sticks of mutton satay. She prepared 250 fewer sticks of mutton than chicken satay. a) How many sticks of chicken satay did she prepare? b) How many sticks of satay did she prepare

altogether?

a) She prepared sticks of chicken satay.

b) She prepared sticks of satay altogether.

480

395

620

990

a) 256 + 224 = 480 b) 480 – 85 = 395

a) 370 + 250 = 620 b) 620 + 370 = 990

64 Review 1

23 Fill in the blanks.

a) The length of the white tape is cm.

b) The length of the black tape is cm.

c) The total length of the two tapes is cm.

d) The black tape is cm longer than the white tape.

Which line is longer, PQ or RS?

P Q

R S Guess: is longer than .

Check: PQ = cm

RS = cm

is longer than .

24

White tape

Black tape

6

8

14

2

PQ RS

10

8

PQ RS

65Review 1

a) Draw a straight line AB 5 cm long.

b) Draw a straight line CD 3 cm longer than Line AB.

25

26 Fill in the blanks with cm or m.

a) Daddy’s height is about 174 .

b) The length of our school field is about 120 .

c) The length of a pencil is about 18 .

d) The width of the hall is about 20 .

27

a) My foot is about cm long.

b) Mother’s foot is about cm long.

c) My foot is cm shorter than Mother’s foot.

My footMother’s foot

cm

m

cm

m

15

22

7

A B

A B

66 Review 1

28

29

Mrs Crawford used 85 m of lace to make curtains. She had 28 m of lace left. How much lace did she have at first?

She had m of lace at first.

Isa uses two ribbons to tie presents. The first ribbon is 242 cm long. The second ribbon is 187 cm long. How much longer is the first ribbon than the second?

The first ribbon is cm longer than the second ribbon.

29 Ahmad is 95 cm tall. Ban Lee is 16 cm taller than Ahmad. Charles is 10 cm shorter than Ban Lee. How tall is Charles?

Charles is cm tall.

30

113

55

101

85 + 28 = 113

242 – 187 = 55

95 + 16 = 111 111 – 10 = 101

math coursebooks 2a part 1

Documents

world of shaping maths

prefaceshaping maths

activity books

learning needs of pupils

teachers resource pack

fantastic mathematics

edition 2a2a par t

d czzy