Singapore math gr 3 textbook 3b

It sold 4 times os mony koyo buns os chocolote buns.. Reod the scoles.o c The pototoes weigh 2 kg 200 Write the weight in groms.. The totol weight of 4 books... .Joh n Dovid o Whot is th

Liang Hin Hoon

Lim Eng Tann

Lim Hui Cheng, Rosalind

@ 1982, 1993 Curriculum Development

'nslitule

of Singapore

@ 1997,1999 Curriculum Planning & Development Dlvision

Ministry ol Education, Singapore

Pub ished by

Times lvledia Privale Limit€d

Anember of the Times Publishing Grcup

Repr nted 2000, 2001 (lwice)

Al rig his reserved No parl ot th s publication may be

reproduced, slored n a retrieva sysiem, ortransmilted,

in any form or by any means, eeclronic, rnechan cal,

p"oLocopy 19 re.o'dirq or orl_prw sF wrtl oullhF prio'

perm sson of the p!blishers.

The project ieam would like lo record their thanks to the loLlowing:

members of the Primary l\,4alhematics Tearn who developed the iirst edilion and second edition of the package

members oi the Steering Committee for the second ediuon of the package

teachers who tested the materials in the package and provided useiul jnsights and suggestions

Educational Techno ogy Division, lor the design and production of the audio-visual components ol the package

all those who have helped in one way or anoiher in the development and production of the package

The Primory Mothemdtics Pockoge comprises textbooks, workbooks, teocher's guides ond oudio-visuol moteriols.

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

-Pictoriol + Abstrqct opprooch The pupils ore provided with the

necessory leorning experiences beginning with the concrete ond

pictoriol stoges, followed by the obstroct stoge to endble them to

leorn mothematics meoningfully Like the previous editions of the

pockoge, this edition encouroges octive thinking processes,

communicotion of mathemoticol ideos ond problem solvinq.

This textbook is cccomponied by two workbooks ond o teocher's guide lt comprises 9 units Eoch unit is divided into ports: @, @,

Eoch port storts with o meoningful situotion for communicotion

ond is followed by specific leorning tosks numbered 1,2, fhe

srg n is used to link the textbook to the workbook

exerctSes.

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

exercises cnd revision exercises orp nnlionnl eyer.i<As

The colour patch 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 potches.

12 13

14

18 19

36

42 43 44

Airport

fiffin

95

2 (o) Whot number is 3 more thon 68?

(b) Whot number is 20 more thon 94?

2 (o) Whot number

It]

39

(b) 60 - s6(d) s0 - 17

(f) 80 - s8(h) 70 - s8

9

80x7 40x8

6 hundreds = 2 = ! hundreds

10 (o) Whot number is 29 less thon 84?

(b) Whot number is 68 less thon 310?

(c) Whot number is 35 more thon 475l,

(d) Whot number is 97 more thon 5397?

11 There cre 80 poges in one exercise book.

How mony poges ore there in 6 exercise books?

12 A shopkeeper pocked 200 onions equolly into 5 bogs.

How mony onions were there in eoch bog?

13 Mr Wu sold 70 buns on Fridoy.

He sold 4 times os mony buns on Sundoy cs on Fridoy.

How mony buns did he sell on Sundcy?

12

(o)

X

6 A coke shop sold 200 koyo buns.

It sold 4 times os mony koyo buns os chocolote buns.

How mony chocolote buns did it sell?

7 A fruit seller bought 9 boxes of peors.

There were 40 peors in eoch box.

How mony peors did he buy cltogether?

8 There ore 6 coins in o set.

How mony coins ore there in 200 sets?

9 Mr Fu pocked 250 tomotoes into pockets of 5 eoch.

(c) How mony pockets of tomotoes were there?

(b) He sold oll the tomotoes ot $2 o pccket.

How much money did he receive?

10 (o) Mr Lin bought 98 blue pens ond 62 red pens How

mony pens did he buy oltogether?

(b) He divided the pens equolly into 8 boxes How mony

Dens were there in ecch box?

13

O Metres ond Centimetres

Cet o metre ruler ond find out how lonq 1 metre is.

Estimote the length of the cholkboord in the clossroom.

Then check by meosuring it with the metre ruler.

The metre (m) ond centimetre (cm)

ore units of length.

1m=100cm

1.

2.

cm cm

5.

7.

Hoshim's long jump

Write the distonce in

9 Lily hos o piece of red ribbon 3 m 40 cm long ond o piece ofyellow ribbon 1 m 85 cm long.

(o) Find the totol length of the ribbons.

3m40cm 1m85cm

3m40cm+1m85cm=lmlcm

The totol length of the ribbons is I m ! cm.

(b) How much longer is the red ribbon thon the yellow ribbon?

two porcels with these strings.

totcl length of the strings?

A bus is obout'10 m long,

The totol length of 100 buses

It is cbout f km from north to south.

(b) The distonce from the Bird Pork to Chongi Airport is

obout I km.

42 km

20

Write the length in metres.

4 The distonce oround o running trqck is 400 m.

Roju ron round the trock 3 times.

6. Write in kilometres ond

route on Sentoso lslond is

k -aa*;)

21

2km450m 1km850m Army Ccrmp

Find the distonce

Post Office between the ormy comp

Which school is neorer

How much neo rer?

2 Write in kilometres ond

(e) 5km950m-4km (f) kmS2Om-72Om

(g) 6km25m-3km35Om

5 Find the distonce between the gun boot

ond the Iighthouse.

4km400m

:E&-2 km 940 ?4

23

The kilogrom (kg) ond grom (9) ore units of weight

lkg=lQggg

The porcel weighs 650 g.

The gropes weigh The popoyo weighs

,-,

It Kilogroms ond Grqms

'1 Reod the scoles.

(o)

(c)

The pototoes weigh 2 kg 200

Write the weight in groms.

Eoch book weighs 350 g.

The totol weight of 4 books

4. A bog of peonuts weighs

How much more peonuts

1100 9

Which is heovier, the

How much heovier?

of the onions ond the

weight between the onions

8sos=19

26

3k980q(o) Find the totol weight of the

PRACTICE 34

1 Write in groms.

(c) 1 ks 4s6 9

(d) 2ke80s (b) (e) 1kg8s2 ks 37o s (c)(f) 3k9808q 4k97 9

2 Write in kilogroms ond groms.

5 Lily weighed 25 kg 750 9 two yeors ogo.

Now she weighs 32 kg.

How much weight hos she goined?

of the jockfruit cnd the

weight between the jockfruit ond

28

More Word Problems

1 A bottle of souce weighs 560 g.

The empty bottle weighs 305 g.

How mony groms of souce ore there in the bottle?

2 A bosket of fruits weighs 1 k9 60 g.

The empty bosket weighs 200 g.

Find the weight of the fruits

5 John weighs 34 k9 600 g.

He is 800 g heovier thon Dovid.

Whot is Dovid's weight?

.Joh n Dovid

(o) Whot is the totol weight

(b) Whot is the difference in

ond the duck?

of the goose ond the duck?

weight between the goose

3 kg2oo g

Coose

Duck

7 A durion weighs 2 kg 50 g.

A jockfruit is 600 9 heovier thon the durion.

(o) Whot is the weight of the jockfruit?

(b) Whot is the totol weight of the two fruits?

Du rion Jockfruit

600 q

1k98009

8 The totol weight of o pocket

2 k9 4OO 9.

lf the pocket of flour weighs

+L^ ^^ Lr rE PuLr\EL (Jr -1.^+ ^f -^l+ >urL.

of flour ond q pocket of solt is

1 kg 950 g, find the weight of

2k940Og

9 The totol weight of o

lf the weight of eoch

If the weight of eoch pocket of sugor is 2 kg,

weight ot the tin ot cooking oil.

wergnr oT z pocKers oT sugor =

Weight ot the tin of cooking oil =

T T

Find the difference in weight between the two porcels.

5 The totol weight of Ali ond Somy is 100 kg.

He is 5 times os heovy os his son.

Find the totol weight of Roju ond his son.

Dovid weighs 39 kg.

Hosson is twice os heovy

Mingli weighs 27 kg less

Whot is Mingli's weight?

os Dovid.

33

5 There ore 24 boxes of chocolotes in o corton.

How mony boxes of chocolotes ore there in 8 cortons?

6 5 people shored $450 equclly.

How much money did eoch person receive?

l. Mrs Lin gove eoch of her friends 7 cup cokes.

She gove owoy 140 cup cokes oltogether.

How mony friends did she give the cup cokes to?

There ore 8 boxes of yellow ond green buttons

There ore 46 buttons in eoch box.

lf there ore 200 yellow buttons, how mony green

507

1806 156

104

359382

5

8

30847009

There were l50 bulbs in o

6 of them were broken.

The rest were pocked into

How mony boxes of bulbs

box.

boxes of 4 bulbs eoch.

were there?

Mr Wong bought three

There were 36 oronges

There were 54 oronges

How mony oronges did

boxes of oronges.

in the first box.

in eoch of the other two boxes.

he buy?

10.

The totol weight of the fruiLs is | 9.

If the opple weighs 90 9, find the

totol weight of the two peors.

lf the peors ore of the some weight,

find the weight of eoch peor.

Litres qnd Millilitres

How much woter is there in eoch of these beokers?

Whot is the totol omount of wcter in ecch set of beokers?

(o)

WffiffiW

36

WW.

W,W WW1fl

1f=10O0ml

Cet some poper cups.

Find out how mony poper cups you

con fill with 1 litre of woter.

WW

2. Cet o poil.

Find out how much

con hold.

woter the poil

The bottle holds 2 litres of worer.

Its copocity is I litres.

3.

37

F,n".-;;; \

The cqpocity of o contqiner

is the omount it con hold We meqsure copocity in

E (o) Cet o bottle which holds less thon 1 litre of woter.

Estimqte ond then meosure its copocity.

(b) Cet o bottle which holds more thon 1 litre of woter Estimote ond then meosure its copocity.

2050 ml

3105 ml

5mm

39

Eoch pocket contoins 250 ml of milk.

The totol omount of milk in 5 pockets is I f I ml.

WWWW

How mcny millilitres more woter ore needed to moke up

2litres?

13.

Which contoiner con hold more woter?

How much more?

40

@b".r*d;;at\

1l800ml

A(o) Find the totol copocity of the

3{350m|

tt

two contoiners.

1{8OOml +3{350rnt =lrl

The totol ccpocity is I f I ml.

(b) Find the difference in copocity between the two

1 Write in litres ond millilitres.

2250 ml '1009 ml

(o) 1

(b) 2

(c) 4

the correct cnswer.

{ is more thon,/equol to,/less thon 980 ml.

f 50 ml is more thon/equol to,/less thon 2O5O ml.

I 8 ml is more thon/equal to./less thqn 4800 ml.

hos the greotest

hos the smollest

copocity?

copocity?

Whot is the totol copocity of the four contoiners?

42

PRACTICE 48

1 The cooccitv of Contoiner A is 2 4 650 ml.

The cooocitv of Contoiner B is 5 { 300 ml.

(o) Whot is the totol copocity of the two contoiners?

(b) How much more woter con Contoiner B hold thon

Contoiner A?

2 Contoiner X holds 2 (, 8OO ml of woter.

Contoiner Y holds 1 { 600 ml more woter thon Contoiner X.

How much woter does Contoiner Y hold?

3 Mrs Chen fills o contoiner with 9 bottles of oronge juice Eoch bottle conloins 2 litres of orcnge juice.

Whot is the copocity of the contoiner?

4 The copocity of o poil is 6 litres.

5 poils of woter ore needed Lo fill up o tcnk

Whot is the copocity of the tonk?

5 The copocity of o contoiner is 24 litres.

How mony poils of woter ore needed to fill up the contoiner

if the copocity of the poil is 3 Iitres?

6 The copocity of o contoiner is 8 litres.

It contoins 4 4 650 ml of wcter

How much more woter is needed to fill up the contqiner?

7 Mr Li bought 6 tins of pcint

Eoch tin contoined 3 litres of point.

He hod 2 4 4OO ml of pcint left after pointing his house.

How much point did he use?

Find the volue of eoch of

5 Mr Chen received $504 for selling pens

How mony pens did he sell?

6 Mr Wu poid $628 for o television set ond 91485 for

o computer.

He hod $5'15 left.

How much money did he hove ot first?

7. Mrs Chen bought 4 boxes of cookies.

There were 12 chocolote cookies ond 8 peonut

eoch box.

How mony cookies were there oltogether?

Mr Li sold 337 pockets of biscuits lost month

He sold 299 more pockets this month thon lost

How mony pockets of biscuits did he sell in the

2

6409

3002t3

9. Solly bought 200 eggs to moke cokes.

She used 8 eggs to mcke eoch coke.

(o) How mony cokes did she moke?

(b) lf she sold oll the cokes ot $10 ecch,

would she receive?

how much money

"i Somy Yonghuo

How mony fish did eoch

This bor groph shows the some informotion.

Minghuo KOnO n Somy Yong h uo

Minghuo cought I fish.

Rohcn cought I fish.

Somy cought I fish.

Yonghuo cought I fish.

They cought I fish oltogettrer.

Minghuo cought I more fish thon Somy.

Minghuc cought I fewer fish thcn Rohon.

I cought the most fish.

I cought the fewest fish.

46

1 This bor groph shows Rohim's exominotion results for four

Use the groph to complete the following

(o) Rohim scored I morks in English.

(b) He scored I morks in Mothemotics

(c) He scored ! more morks in Mcthemotics thcn in

2 This bor groph shows Sulicn's sovings for four months.

Use the groph to onswer the following questions.

(o) How much did Sulion scve in Moy?

(b) How much more did she sove in June thon in Moy?

(c) In which month did she sove $15?

(d) In which month did she sove the most?

(e) In which month did she sove twice os much os in

August?

(f) Whot wos her totol scvings for the four months?

4A

3 This bor groph shows the number of books reod by five children in o yeor.

80 70

Number 60

of books

50 40 30 20

10

0

Dovid Mory

Use the groph to qnswer the following questions.

(o) How mony books did Siti reod?

(b) How mony books did Dovid reod?

(c) How mony more books did Dovid reod thon Meiling?

(d) Who reod 5 fewer books thon Meiling?

(e) Who reod the most books?

(f) Who reod the fewest books?

49

Meiling Hosson

150 100

50 0

Mon Tue Wed Thu Fri

Use the groph to onswer the following questions.

(o) How mony people visited the book foir on Tuesdoy?(b) How mony more people visited the book foir on Friday

thon on Thursdoy?

(c) On which doy wos the number of visitors the smollest?

(d) On which doy were there os mony visitors os on

Mondoy?

(e) On which doy were there twice os mony visitors os on Wednesdoy?

(f) lf there were 200 odults on Tuesdoy, how mony

children were there?

50

(c)

J of the bor is shoded.

3 'r I out of the I equol porrs.

? = a fifths

(b) ; .f the bor is not shoded.

I is I out ofthe I equol ports.

8 or tne Dor ts shoded.

I of the bor is not shoded.

3 Whot froction of eoch shope is shoded?

(h)

53

tr,';;""".,*.*\

numerotor ond 4 is the

denominotor of eoch of these

The froctions ono 3 nove o common numerotor.

10

33 i'7JO

1

9

35

^l^

I is the smollest froction

I is the greotest froction

The froctions ond hove o common denominotor.

10.

I is the smollest froction

I is the greotest froction

Arronge the froctions in order.

fregrn wttn tne smo est.

111

\-./ F,

)t3

574 ''' 8' 8' 8

workbook ExeKces 29 & 30

It is eosy to compore froctions when

they hove o common numerotor

or o common denominotor.

'1 Find the missing numbers.

(o)

IondImokelwhole.

(b) * ond I moke'l whole.

@) $ond I moke l whole.

2 Ncme the numerotor of eoch froction

(b)

; oT rne poper rs snooeo.

Fold the poper ogcin.

8

?1

more equivolent froctions of ?.

(e) l)

59

4 Whot ore the missinq numerotors ond denominotors?

or4A

2(b) ;=

4 4

I

,l

5 6

$10 notes con you get for $200?

5C coins con you get for $1.50?

f

10 11

tat - tTl

I

7 3

;

at

REVIEW D

Write the numbers.

(c) Nine thousond, two hundred cnd ten

(b) Four thousond ond sixty

Write the numbers in words.

@) 62oa (b) 3s40 (c) s028

Whot number is 100 less thon 4000?

Write the numbers in order, beginning with the smollest.

(o) 4104, 4014, 4041, 4410

(b) 2211, 1112, 2111, 2121

Find the product of 125 ond B.

Find the quotient ond remoinder when 500 is divided by 8.

Whot number must be subtrocted from 55 to give the

onswer 44?

10.

63