Singapore math gr 3 textbook 3a

How mony tickets were sold on Soturdcry.. b How mony tickets were not sold?. How mony curry puffs were sold oltogether?6.. o How mony fewer pupils ore in the ofternoon session thon in th

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Q[6 Mtusrnv oF EDUcArtoN, Strucepone

Liang Hin Hoon

Lim Eng Tann

Lim Hui Cheng, Rosalind

Sin Kwai lvleng

$/o r; m*lw I'Lullc & DsEv E LopPM E Nr D rvr s

I o N

IIEI ilil'utflJl'uu"noon

The Primory Mothemotics Pockoge comprises textbooks,

workbooks, teocher's guides ond oudio-visuol moteriols.

The moin feoture of the pockoge is the use of the Concrete r

Pictoriol r Abstroct opprooch The pupils ore provided with the

necessory lecrning experiences beginning with the concrete ond

pictoriol stoges, followed by the obstroct stoge to enoble them toleorn mothemotics meoningfully Like the previous editions ofthe pockoge, this edition encouroges octive thinking processes,

communicotion of mothemoticol ideos ond oroblem solvino.

This textbook is occomponied by two workbooks ond o teocher's guide lt comprises 5 units Eoch unit is divided into ports: Q, @,

Eoch port storts with o meoningful situotion for communicotion ond is followed by specific leorning tosks numbered 1,2, The

srg n is used to link Lhe textbook Lo the workbook

exerctseS.

Proctice exercises ore designed to provide the pupils with furtherproctice ofter they hove done the relevont workbook exercises Review exercises ond revision exercises ore orovided for cumulotive reviews of concepts ond skills All the proctice exercises, review

exercises ond revision exercises ore optionol exercises.

The colour potch I is used to invite active porticipotion from the

pupils ond to focilitote orol discussion The pupils ore odvised not

to write on the colour Dotches.

Tens ond Ones

Addition ond Subtroction

Sum ond Difference

PRACTICE 2A

PRACTICE 2B

Adding Ones, Jbns, Hundreds ond

Subtrocting Ones, Tens, H undreds

Quotient ond Remoinder

Dividing Hundreds, Tens ond

Tens ond Hundreds

lnousonos

18

22 23

4447

48 49

)z+

55 56 57

61

Ones

93

9498

102

103

1o4

REVIEW B

EEEEE'10 hundreds l thousond

(o) Sumin collected some morbles

E8

E- EE

3 hundreds 4 tens

aara aaa

(b) His sister olso collected some morbles.

8E 2 thouscnds FE4 hundreds

2000+400+30+5=l

How mony morbles did she collect?

Reod the numbers 5998 ond 6012

LOUnt TrOm 5yy6 to bu

2 Whot numbers ore shown below?

three thousond, two hundred ond seventY-four

Reod eoch number

6824 is o 4-digit number

The digit 2 stcnds for 20

The digit 6 stonds for 6000

Whot does the digit 8 stond for?

Whot does the digit 4 stond for?

8 Write the word greqter or smoller in ploce of eoch l.

Begin with the greotest.

Arronge the numbers in order:

'1892, 9003, 913, 1703

Begin with the smollest

Use oll the digits 0, 4 ond 5 to

moke different 3-digit numbers

Which is the greotest number?

Which is the smollest number?

M (o) Whot is the greotest 4-digit number thot you con moke

using oll the digits O,7,2 ond B?.

(b) Whot is the smqllest 4-digit number thot you con moke

using oll the digits 3,7, 4 ond 9t

t w"-"""**,",* \

1l

999 is the greqtest

3-digit number.

PRACTICE 1A

1 Write the numbers

(o) Two thousond, one hundred ond sixty-three

(b) Eight thousond ond eight

(c) Three thousond ond six hundred

(d) One thousond, three hundred ond seventy-six

(e) Four thousond ond five

2 Write the numbers in words

6 Write the underlined words in fiqures

(o) The height of Mount Fuji in Jopon is three thousond

seven hundred ond seventv-six metres

(b) Mr Wong bought o computer for two thousond ond

sixtv dollors

3000 +

6000 +

Which is more? How mony more?

Whot number is 100 more thon 6442?

Whot number is 100 more thon 6542?

Complete the number pottern

14

1 (o) Whot number is 100 more rhon 3624?

') (o) Whot number is 1000 less thon 5732?

3 (o) Count in steps of 10 from 1678 to 1728.

PRACTICE lC

1 Whot is the volue of the digit 8 in eoch of the following?

(o) 78e2 (b) 3468 (c) 800s (d) 7081

2 Whot does eoch digit in 5629 stond for?

3 (o) In 6243, the digit ! is in the tens plcce

(e) 3040, l, so+0, eo+o

6 Complete the following number potterns

(o) l, 54oo, s4o1, 5402

(b) 3420, l, zazo, ztzo

(c) 43s0, 33s0, L 13so

(d) 8160, 7150, 6160, I

(e) 5722, 5712, 5702, a

Addition ond Subtroction

The sum of 4 ond 7 is

Whot is the difference

The sum of 90 ond 54

The difference between

sum of 12 ond 9 is !.

sum of two numbers is 21.

lf one number is 9, the other number is l.

The difference between 21 ond 9 is l.

The difference between 21 ond 12 is l.

4 Mory mode 686 biscuits She sold some of them' lf 298

were left over, how mony biscuits did she sell?

- number mode646-

?

number sold

5.

686-298=l

She sold I biscuits

A mon sold 230 bolloons ot o funfoir in the

He sold onother 86 bolloons in the evening

How mony bolloons did he sell in oll?

230+86=l

294

number left

mornlng

To find the shoded port,

we subtroct the other pqrt

from the whole.

He sold I bolloons in oll

20

6. 134 g|rls ond 119 boys took port in on

How mony more girls thon boys were

did he reod in the qfternoon?

did he reod oltogether?

She soved $63 more

How much did Betty

184-63=l

Betty soved $1.

John reod 32 poges in

He reod 14 poges less

(o) How many poges

(b) How mony poges

384 432

(f-Leelc hos 254 rubber bcnds

Her friend gives her 58 more

How mony rubber bonds hos she now?

A mon bought 650 curry puffs for o porty

There were 39 curry puffs left ofter the porty

How mony curry puffs were ecten during the porty?

l The sum of two numbers is 175

lf one number is 49, whot is the other number?

8.

49

The difference between

lf the smoller number is

The difference between two numbers is 48

lf the bigger number is 126, whot is the smcller number?

22

68

9.

5. Mr Wong poid $850 for o television set.

He still hod $450 left

How much money hod he ot first?

429 concert tickets were sold on Sundoy

64 more concert tickets were sold on Sundcy thon on

Soturdoy

How mony tickets were sold on Soturdcry?

This toble shows the number of

biscuits mode by three mochines

in one hou r.

(o) Whot is the totol number of

biscuits mode by Mochine A

ond Mochine B?

(b) Whot is the totol number of

mochines?

biscuits mode by the three

Rovi hod 35 tickets to sell.

He sold 15 tickets yesterdoy ond 9 tickets todoy

(o) How mony tickets did he sell on the two doys?

(b) How mony tickets were not sold?

Dqvid collected 830 scAo seeds.

Peter collected 177 fewer sogo seeds thon Dovid

(o) How mony sogo seeds did Peter collect?

(b) How mony sogo seeds did they collect oltogether?

o.

7.

8

9.

O Adding Ones, Tens, Hundreds ond

1. Find the vslue of

5. Find the volue of

(o) 1028 + 234

(c) 4190 + 649

(e) 6204 + 993

6 Find the sum of 1266 ond 2355

7. Find the volue of

(o) 1326 + 194

(c) s471 + 787

(e) 7246 + 845

(b)(d)

++

51581095

8 Find the sum of 3589 ond 2443.

OOOr

666

ooo ,Or :-Oo

Subtrocting Ones, Tens, Hundreds ond

Thousqnds

Find the difference between 3246 ond 1634

32 46

As there ore not enough hundreds

to subtroct from, we chonge

1 thousond for '10 hundreds.

@

OOO QOO

1 Find the vclue of

5 Find the volue of

1807

30

8 Find the difference between 5243 ond 2787.

10 Find the difference between 6000 ond 257.

6000

257

I

Chonge l thousond for t hundreds,

9 tens ond 10 ones.

ooo ooo

oot

o

ooo caai

32

How mony curry puffs were sold oltogether?

6 1730 people visited o book foir in the morning

2545 oeoole visited the book foir in the ofternoon

How mony more people visited the book foir in the

cfternoon thon in the morninq?

7 52937 were donoted bv Encik AIi ond Mr Lin.

Encik Ali donoted $1450

How much money did Mr Lin donote?

8 Mr Muthu eorned $3265

His wife eorned $2955

How much more money did he eorn thon his wife?

9 1147 people went to Sentoso by coble cor.

3996 more people went to Sentoso by ferry thon by coble

cgr.

How mony people went to Sentoso by ferry?

Alice soved $2900

She soved $1567 less thon her brother

How much did her brother sove?

34

10.

5 There were 2055 people ot o concert.

1637 of them were odults

How mony children were there?

6 There ore 1206 pupils in o school

47 of them were qbsent yesterdoy

How mony pupils were present?

7 Out of 2316 tickets sold 1548 tickets were for o footboll

mctch

The rest were for o bodminton motch

How mony tickets for the bodminton motch were sold?

8 The toble shows the prices of two

picnos

How much cheoper is Piono B thon

Piono A?

9 Encik Rohmot hod $5000

He spent $2572 on o computer ond $955 on o television

set

(o) How much money did he spend?

(b) How much money hod he left?

10 ln o school, there ore 1225 pupils in the morning session

ond 904 oupils in the ofternoon session

(o) How mony fewer pupils ore in the ofternoon session

thon in the morning session?

(b) How mcny pupils ore there oltogether?

@ Two-step Word Problems

Jomes picked 17 rombutons ond Liming picked 12.

They ote 20 of the rcmbutons

How mony rombutons were left?

picked oltogether first.

I rombutons were left

36

1. 125 children took port

54 of them were girls

How mony more boys

There were I more boys thon girls

AIi collected 137 stomps

He collected 27 stomps less

How mony stomps did they

thon his sister

1 A former collected 1930 chicken eggs

He collected 859 fewer duck eggs thon chicken eggs

How mony eggs did he collect oltogether?

4100 children took port in on ort competition

2680 of them were boys

How mony more boys thon girls were there?

Encik Ali mode 1050 sticks of chicken

sotoy ond 950 sticks of mutton sotcy

He sold 1765 sticks of sotoy oltogether

How mony sticks of sotoy hod he left?

Mr Li eorned $3915

5.

He spent $1268 on food ond $1380 on rent ond tronsport

How much did he hove left?

A refrigerotor costs $1739

An oven is $850 cheoper thon the refrigerotor

Mrs Chen buys both the refrigerotor cnd the oven

.How much does she poy?

7.

Meiling hod $2467 in o bonk

She deposited onother $133

How much more money must she deposit

hove $3000 in the bonk?

There ore 4608 members in c club

2745 of them ore men

855 ore women

The rest ore children

How mony children qre there?

8 Miss Li soved $1035

Miss Wong sqved $278 more thon Miss Li.

Miss Wu soved $105 less thon Miss Wong

How much did Miss Wu sove?

1. Comolete the number sentences.

4+4+4=f 3+3+3+3=l

2 Whot ore the missinq numbers?

3. How mony stqrs ore there on eoch poir of cords?

A A ployer threw 3 rings over the post

For eoch ring thot wqs thrown in, the ployer scored 2 points

How mony points were scored in eoch of the following?

5. There ore 8 buttons on eoch cord.

How mony buttons qre there on 5 cords?

Bx5=l

There ore I buttons oltogether

A toilor used 21 m of cloth to moke dresses.

She used 3 m of cloth for eoch dress.

How monv dresses did she moke?

21 +3=l

e

/ao f:7t

4 Mrs Fu bought 3 pockets of strowberries.

There were 8 strowberries in eoch pocket

How mony strcrwberries did she buy oltogether?

Sumin orronged 24 toy soldiers in 4 rows

There were on equol number of toy soldiers in eoch row

How monv tov soldiers were there in eoch row?

6 Devi soved $5 o week for 8 weeks

How much did she sove cltoqether?

7 Cik Siti poid $18 for 3 kg of durians

Whot wos the cost of 1 kg of durions?

8 Mrs Wu boked 6 cokes.

She put 10 cherries on eoch coke

How mony cherries did she use oltogether?

Dovid bought 4 pineopples ot $3 eoch

How much did he poy oltogether?

There were 27 desks to cleon

3 boys shored the work equolly

How mony desks did eoch boy cleon?

'I '1 3 children mode 24 birthdoy cords oltogether.

Each child mode the some number of cords

How mony cords did eoch child moke?

a o

9.

10.

43

@ More Word Problems

1. Meihuo hos $16.

She hos twice os much

How much money does

Meihuq

Sulin

16:2 =l

Sulin hos $1.

2 4 children bought o present for $28

They shored the cost equolly

How much did eoch child poy?

3. 5 children shored the cost

Eoch of them poid $6.

Whot wos the cost of the

4 A former hos 7 ducks

He hos 5 times os mony chickens os ducks

How mony more chickens thon ducks does he hove?

Find the number of

chickens first.

7

w

5 sets of 8 books in the morning.

books in the ofternoon

books did she mork in the morning?

books did she mork oltogether?

12 There ore 9 red bolloons

There ore 3 times os mony blue bolloons os

6 There ore 6 rows of choirs

There ore 30 choirs oltogether

How mony choirs ore there in eoch row?

A troin set costs 5 times os much os the toy cor.

Whot is the cost of the troin set?

8 Mrs Li bought 10 towels

Eoch towel cost $8

How much did she poy?

9 Hosson weigirs 36 kg.

He is 4 times os heovy os his brother

How heovy is his brother?

10 Mrs Wu bought 4 boxes of pencils

There were 5 blue pencils ond 3 red pencils in eoch box

(o) How mony pencils were there in eoch box?

(b) How mony pencils did Mrs Wu buy?

41

90+ 10 2x

6x 3780

6 Ahmod eorned $10 o doy

He worked for 7 doys

How much did he eorn oltogether?

7 Cik Fotimoh bought 15 kg of rice.

She bought 3 times os much rice os sugor

How mony kilogroms of sugor did she buy?

8 Devi proctised on the piono for 2 hours eoch doy

How mony hours did she proctise in 7 doys?

9 Mrs Li poured 16 litres of syrup equolly into 4 botttes

How mony litres of syrup were there in eoch bottle?

10 Meihuo hos 6 postcords

Sumin hos 3 times os mony postcords os Meihuo

How mony more postcords does Sumin hove thon @

11 Minffo hos 6 goldfish

He hos 5 times os mony guppies os

goldfish

lf he puts his guppies equolly into 3 tonks,

how mony guppies ore there in eoch tonk?

12 Rcju bought 18 pencils

He bought twice os mony pencils os pens.

How much did he poy for the pens if eoch pen cost $3?

1 Find the volue of

Ge) , j@)

i&&'& &&

@@@

t,&&@,

z5l 234 436

26

Multiply thetens by 3.

1026

Multiply thehundreds by 3.

35

Multiply thetens by 3,

735

Multiply thehundreds by 3.

53

6x 9x 72x +x

8 A bookseller sold 30 books on the first doy

On the second doy, he sold 8 times os mony books os on

the first dov

How mony books did he sell on the second

9 Mingfo hod 4 rolls of film

He took 24 oictures with eoch roll

How mony pictures did he toke oltogether?

There cre 5 rows of tiles

There ore 56 tiles in eqch row

How mony tiles ore there oltogether?

Meihuo collected 76 stickers

Sulin collected 3 times os mony stickers os Meihuo

How mony stickers did Sulin collect?

12 Devi bought 4 dolls ot $38 each

How much did she poy oltogether?

54

10.

11

(d)4x550 5x392

There ore 126 pins in one box

How mony pins ore there in 3 boxes?

A rodio costs $262

A television set costs 4 times os much cs the rodio

How much does the television set cost?

Mrs Wong bought 3 boxes of beods

There were 260 beods in eoch box

How mony becds did she buy oltogether?

One pocket of biscuits weighs 250 g.

Whot is the totol weight of 5 pockets of biscuits?

Mrs Chen sold 680 eggs lost week

She sold 4 times os mony eggs this week os lost week

How mony eggs did she sell oltogether?

9.

10.

11 The refrigerotor costs

Whot is the totol cost

cooker?

5 times os much os the rice coorer

of the refrigerotor cnd the rice