singapore math gr 3 textbook 3 b

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Page 1: Singapore math gr 3 textbook 3 b
Page 2: Singapore math gr 3 textbook 3 b

PROMARVMNTHEMATOGS 3B

Primary Mathematics Proiect Team

Project DireciorDr Kho Tek Hong

Team MembersChee Kum Hoong, HeclorChip Wd LungLiang Hin HoonLim Eng TannLim Hui Cheng, RosalindNg Hwee WanNg Siew Lee

Curriculum SpecialistsCheong Ngan Peng, ChristinaHo Juan Beng

::ll Curriculum Planning & Development DivisionMinistry of Education, Singapore

ffirr"EP,5SA,tAn inorint of fines Media

Page 3: Singapore math gr 3 textbook 3 b

@ 1982, 1993 Curriculum Development 'nslitule

of Singapore@ 1997,1999 Curriculum Planning & Development Dlvision

Ministry ol Education, Singapore

Pub ished byTimes lvledia Privale Limit€dAnember of the Times Publishing GrcupTimes Cenire1 New lndust al RoadSingapore 536196E-mail: lps @ tpl.corn.sgOn ne Book Slore: hltp://www.timesone.com.sg/fpl

First publlshed 1982Second Edilion 1993Th rd Ed tion 1999Repr nted 2000, 2001 (lwice)

Al rig his reserved. No parl ot th s publication may bereproduced, 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.

tsBN 981 01 8050 0

Prinled in Singapore by C.O.S. Pinterc Pte Ltd

llluslratorPau Yong

ACKNOWLEDGEMENTS

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 secondedition 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 andsuggestions

. Educational Techno ogy Division, lor the design and production of the audio-visualcomponents ol the package

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

Page 4: Singapore math gr 3 textbook 3 b

PREFACE

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 thenecessory leorning experiences beginning with the concrete ondpictoriol stoges, followed by the obstroct stoge to endble them toleorn mothematics meoningfully. Like the previous editions of thepockoge, this edition encouroges octive thinking processes,communicotion of mathemoticol ideos ond problem solvinq.

This textbook is cccomponied by two workbooks ond o teocher'sguide. lt comprises 9 units. Eoch unit is divided into ports: @, @,. . . Eoch port storts with o meoningful situotion for communicotionond is followed by specific leorning tosks numbered 1,2, . . . fhesrg n is used to link the textbook to the workbookexerctSes.

Proctice exercises ore designed to provide the pupils with furtherproctice ofter they hove done the relevont workbook exercises.

Review exercises ond revision exercises ore provided for cumulotivereviews of concepts ond skills. All the proctice exercises. reviewexercises cnd revision exercises orp nnlionnl eyer.i<As

The colour patch I is used to invite active porticipotion from thepupils ond to focilitote orol discussion. The pupils ore odvised notto write on the colour potches.

Page 5: Singapore math gr 3 textbook 3 b

CONTENTS

Mentol Colculotion1 Additlon2 Subtroction3 Multiplication4 Division

PRACTICE 1A

PRACTICE 1B

Length'l ' Metres ond Centimetres

PRACTICE 242 Kilometres

PRACTICE 28

Weight'l Kilogroms ond Croms

PRACTICE 342 More Word Problems

PRACTICE 38

Review A

Review B

CqpocityLitres ond MillilitresPRACTICE 44PRACTICE 48

6

810

11

12

13

14

18

19

23

34

35

24282933

364243

44

Airport

Review C @@ffiffi

Page 6: Singapore math gr 3 textbook 3 b

GrophsBor Crophs

Froctions1 Froction of o Whole

PRACTICE 642 Equivolent Froctions

PRACTICE 6B

Review D

Time1 Hours ond Minutes

PRACTICE 742 Other Units of Time

PRACTICE 78

Review E

Geometry1 Angles2 Right Angles

Areo ond Perimeter1 Areo2 Perimeter

3 Areo of o RectonglePRACTICE 9A

Review F

45

6

8t0

l1

t2

t3

t4

t8

t9

r3

t8

t9i3

|612

L?

t4

fl

565762

63

fiffin

6573

7476

77

14

t5

7981

83889294

95

Page 7: Singapore math gr 3 textbook 3 b

Mentol Cqlculqtion

O AdditionAdd 46 ond27.

oa@wawffia@@

46

@ffi@

a@@.WW

27

+2O +7+O -------------+ OO + /5

46+27=a

6

46+27

207Add 20 to 46 first.

""m

Page 8: Singapore math gr 3 textbook 3 b

1. (o) 23 *'0, I *4, I23+14=a

16) s419- I *6, 15++36=l

(c) 38 -119, I *s, I38+45=l

2. (o) Whot number is 3 more thon 68?(b) Whot number is 20 more thon 94?

3. Add.(o) 43 + 30 (b) 67 + 20 (c) 85 + s0(d)72+s (e)33+7 (f)64+8(s)36+23 (h)27+3s (D ss+26

f ilil;ili

4. Find the sum of 58 ond 16.

58+16=l

s. Add.(o) 39 + 27 (b) sB + 34 (c) 4s + 6s

l- -",b""k ',.*- \

Page 9: Singapore math gr 3 textbook 3 b

@ Subtrqction

1.

Subtroct 34 from 87 .

OWowoawoa wwaa @wt--Y ]

a7

a7 -34,/\

304Subtrqct 30 from 87 first.

-30 -46t-5l-..._5J

S7 -34=l

(o) 6s ---l!- I -', IO5-12=l

rhr za -i0 . I -5. It6-46=l

(c) 6: --?9; I -t, I03-28=l

8

Page 10: Singapore math gr 3 textbook 3 b

2. (o) Whot number(b) Whot number

z tess fnon 5 t(30 less thon 76?

3. Subtroct.(o) 70 - 30(c) 68 - 60(e) 83-3

Subtroct.lo) 46 - 52

(c\ R7 - 47

A

(b) ss(d) s8(f) 47

(b) 64(d) s6(f) 63

-70-6_J

-34

-55

5. Find the difference between 90 ond 18.

90-18=l

o. Subtroct./'n\ ?O

-(c) 70 -(e) a0 -@) a0-(D s0-

2a6529It]39

(b) 60 - s6(d) s0 - 17(f) 80 - s8(h) 70 - s8

9

Page 11: Singapore math gr 3 textbook 3 b

Multiplicqtion

3 tens x 4=12tens

30x4=I

r. to) rvrurupry b rens oy 5. 6tensx5=ltens

60r5=l

(b) Multiply 4 hundreds by 3.

400x3=l

2. Multiply.(o) 8x7(d) s0x9(s) 600 x 3

(b)(")(h)

80x740x8300x5

(c) 800 x 7(f) 90x6(D 7oox4

f;;.,,*.^* '-

4 hundreds ; 3 = | hundreds

10

Page 12: Singapore math gr 3 textbook 3 b

\

$bt

@ Division

'1.

6tens:3=2tens

60*3=l(o) Divide 8 tens by 4.

80*4=I

(b) Divide 6 hundreds by 2.

600*2=l

(b)

(h)

fo

I

2. Divide(o) 9+ 3(d) 40+2(9) 320 + 8

90-3360-624OO + 4

(c) 900 + 3(f) 400 - 10(i) 1oo0 - 5

lilil;;; -\

11

8tens=4=ltens

6 hundreds = 2 = ! hundreds

Page 13: Singapore math gr 3 textbook 3 b

PRACTICE 1A

Find the volue of eoch of the following:

(o) (b) (c)

1. 65+28 34+66 18+842. 99+99 99+98 27+453. 78-45 90-56 90-854. 99-98 83-75 98-975. 4x30 50x8 200x96. 500 - 5 600: 10 400 _ 27. 100x6 5x90 300x78. 160+8 240-3 810+99. 6x100 40x6 500x5

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

Page 14: Singapore math gr 3 textbook 3 b

PRACTICE 18

Find the volue of eoch of the followinq:

(b)

t. fu2. 403.64. 270

5. Alice sovesHow much

6080

7320

$50 o month.does she sove in 8 months?

30600300720

(.)

x6+-3x8+-9

x5+4x 400+8

3290q

(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. Howmony pens did he buy oltogether?

(b) He divided the pens equolly into 8 boxes. How monyDens were there in ecch box?

13

Page 15: Singapore math gr 3 textbook 3 b

Length

O Metres ond CentimetresCet 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.

l=lHl=lriF:?l

ls the length closerto2mor3rn?

Estimote the height of the doorCheck by meosuring.

in your clossroom.

ls the door 2 m high?

14

Page 16: Singapore math gr 3 textbook 3 b

The metre (m) ond centimetre (cm)ore units of length.

1m=100cm

1.

2.

cm

cm

Ali's height(c) 1m2s(b) 1m2s

25 cm.

I cm more thon 1 m.

1..IS 1m

(o) Write 2 m in centimetres.261 =lcm

(b) Write 300 cm in metres.

3OOcm=lm

Wolk 5 steps.Mecsure the distonce in metres ond centimetres.Then write the distance in centimetres.

3.

,,15

Page 17: Singapore math gr 3 textbook 3 b

4.

5.

7.

Hoshim's long jumpWrite the distonce in1m45cm-1..

result is 1 m 45 cm.centimetres.

m55cmm8cm

qnd centimetres.

Write in centimetres.(o) 1m90cm (b) 1

(d) 2m89cm (e) 3

A cor is 395 cm long.Write the length in metres

(c) 2m(fl am

86 cm6cm

6.

/- ^_---*:-----\I JUUcm=Jm I\- oJ

8.

395cm-lmlcm

Write in metres ond centimetres.(o) 180 cm (b) 195 cm(d) 299 cm (e) 304 cm

The tqble shows the results of the shot

(c) 262 cm(f) 409 cm

put finols.

Arronge the distonces in order. Begin with the shortest.

t;il"k,*;; \

Page 18: Singapore math gr 3 textbook 3 b

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?3m40cm

1m85cm

3m40cm_img5cm=lmlcm

The red ribbon is I rn I cm longer thon

l..^- .l ''., ". o; "r:++ , ;

the yellow ribbon.

1l

Page 19: Singapore math gr 3 textbook 3 b

PRACTICE 2A1. Write in centimetres.

(o) 4m (b) 1m40cm(d) 3m95cm (e) 4m5cm

2. Write in metres ond centimetres.(o) 120 cm (b) 225 cm(d) 618 cm (e) 963 cm

(c) 2(f) e

m25cmm9cm

(c)(f)

309 cm405 cm

3. Find

(o)

(b)

(c)

(d)

(e)

(f)

Add(o)(c)(e)(g)

the missing numbers.

1m-65cm-lcm1m-55cm-lcm2m- 1m75cm-1..2m-95cm=lmlcm3m- 2m92cm-1..

A

5. Rohim is 1 mRoju is 16 cmWhot is Roju'

6. Mr Chen tied

60 cm toll.shorter thon Rohim.

s height?

two porcels with these strings.

totcl length of the strings?

18

3m40cm-6cm=lmlcm

or subtroct2m75cm1m26cm5m85cm2m55cm

in compound units.+3m (b) 3+2m65cm (d) 4-5m (f) s

-1m50cm(h) 3

m4cm+65cmm8cm+1m95cmm90cm-76cmm6cm-2m25cm

1m80cm 1m65cm

Whot wos the

Page 20: Singapore math gr 3 textbook 3 b

O KilometresThe kilometre (km), metre (m) ond centimetre (cm) ore unitsof length.

1kmtm

&=

A bus is obout'10 m long,The totol length of 100 busesis obout 1 km.

r-

We meosure long distoncesin kilometres.

19

Page 21: Singapore math gr 3 textbook 3 b

1.1010 m 740 m ---- !

Jordine Steps

(o) The distonce between Sentoso ond Jordine Stepsislkmlm.

(b) The distonce between Mount Fober ond Sentosoislkmlm.

23 km

(c) The distonce ocross Singopore is obout I km from westfo eoSt.

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

Page 22: Singapore math gr 3 textbook 3 b

+.i=.:. I

ti;t:; i

irunr iDer l

.iiiitj'

(m

Sentoso3.

The totol length of the Monoroilobout 6 km 100 m.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(o) 1830 m (b)(d) 30s6 m (e)

(c) 2 km 605 m(f) 4kmsm

2km3km

(c)(f)

2780 m4009 m

Heronlkmlm.

5. Write in metres.(o) 1 km 600 m(d) 3kmSsm

(b)

metres.23O4 m3040 m

550 m20m

route on Sentoso lslond is

k---aa*;)

21

Page 23: Singapore math gr 3 textbook 3 b

2km450m 1km850m

Army Ccrmp

Find the distonce

Post Office

between the ormy comp

Librory

ond the librory.

2 km 450 m + 1 km 850 m = | km I m

The distonce between the ormy comp ond the librory is

!kmlm.

'1 km40m 920 m

School A

Which school is neorerHow much neo rer?

MRT Stqtion

to the MRT stotion?

School B

1km40m-92Om=lm

School B is ! m neorer to the MRT stction.

22

Page 24: Singapore math gr 3 textbook 3 b

PRACTICE 281. Write in metres.

(o) 3 km(d) 2km60m

1km450m3km78m

metres.1085 m3999 m

(b)(")

(c) 2 km(fl akm

(.)(f)

506 m9m

2. Write in kilometres ond(c) 1680 m (b)(d) 30e0 m (e)

2204 m4001 m

. :e

w

3. Find the missing numbers.

(o) 1km-800m=lm(b) 1km-600m=lm(c) 2km-1km45m=lm(d) 1km-40m=lm(e) 5km-4km94Om=lm(f) 2km-275m-lkmlm

4. Add or subtroct in compound units.(o) 2km650m+3km(b) 3km460m+50m(c) 3km300m+800m(d) km700m+1km300m(e) 5km950m-4km(f) kmS2Om-72Om(g) 6km25m-3km35Om(h) 5km40m-3km990m

5. Find the distonce between the gun bootond the Iighthouse.

4km400m:E&-

2 km 940 ?423

Page 25: Singapore math gr 3 textbook 3 b

Weight

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

ls. lksIs.

Page 26: Singapore math gr 3 textbook 3 b

'1. Reod the scoles.

(o)

(c)

The pototoes weigh 2 kg 200Write the weight in groms.

Eoch book weighs 350 g.The totol weight of 4 books

islkgle.

2. 9.

3.

2kg=2OOOg

25

f;;r;G,r \

Page 27: Singapore math gr 3 textbook 3 b

4. A bog of peonuts weighsHow much more peonuts

1100 9

Which is heovier, theHow much heovier?

to moke up 21 k9 850 g.ore needed kg?

a-':' lkg-2ks-lkgsso9=ln

1kg25O g

fish or the chicken?

(o)

(b)

2ks600s

Whot is the totol weighttomotoes?Whct is the difference inond the tomatoes?

lkgsOOg

of the onions ond the

weight between the onions

8sos=19

26

Page 28: Singapore math gr 3 textbook 3 b

7.

3k980q

(o) Find the totol weight of theDqnonoS.

3ks80s+1k9960s=l

1k99609

wotermelon ond the

ksls

The

(b) Findond

3kg

totol weight is I kg I g.

the difference in weight betweenthe bononos.

809-1ks9609=IksIs

the wotermelon

The difference in weight is ! kg | 9.

2/

f*"*;",*;; \

Page 29: Singapore math gr 3 textbook 3 b

PRACTICE 341. Write in groms.

(c) 1 ks 4s6 9(d) 2ke80s

(b) 2 ks 37o s(e) 1kg8s

3k9808q(c)(f) 4k97 9

2. Write in kilogroms ond groms.

@) 21a3 s(d) 2206 e

(b) 13sa e(e) 308s s

Find the missing numbers.

(o) 1k9-395s=ln

(c) 3800(f) 400e

sI

3.

s=f s3k9-805s=lksIsor subtroct in compound units.3 kg 500 g+2kg

3k9 109-2O094 k9 25o s - 1 k9 s00 9 (h) 5 ks - 2 k9 905 9

5. Lily weighed 25 kg 750 9 two yeors ogo.Now she weighs 32 kg.How much weight hos she goined?

6. A jockfruit weighs 2 k9 990 g.A wctermelon weighs 4 kg 200 g.(o) Find the totol weight

wotermeton.(b) Find the difference in

the wotermelon.

(b) lks-85e=ln(c) 3ks -2ks4oos=fs(d) sk9 -4ks60s=lg(e)

(f)

4. Add(o)(c)(e)(s)

1k9-540

3k9 1009+1k99009(b) +ks650s+4509(d) 2ks 509+4ks70s(f) +ks300s-1ks50g

of the jockfruit cnd the

weight between the jockfruit ond

28

Page 30: Singapore math gr 3 textbook 3 b

More Word Problems

350 g

Weight of morbles = 1 kg 20O 9 - 350 9

2kg

t)P

lkg

w.=., .,: ::.::.11kg 20O g

=1929

Page 31: Singapore math gr 3 textbook 3 b

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.

3. Mr Wu's weightHe is 3 times osWhot is Sumin's

is 57 kg.heovy os Sumin.weight?

suminW\-1.-,

?

3 units = 57 kg

lunit =lk9

A

Sumin's weight is I kg.

A wotermelon is 5 times oslf the popoyo weighs 950 g,wotermeton.

heovy osfind the

o popoys.weight of the

Wotermelon

eopoyoW:.--:.95O9

1 unit = 950 gWeight of wotermelon = 5 units

lg=lksIs

30

Page 32: Singapore math gr 3 textbook 3 b

5. John weighs 34 k9 600 g.He is 800 g heovier thon Dovid.Whot is Dovid's weight?

.Joh n

Dovid

? 800 g

Dovid's weight - 34 kg 600 g - 800 g

=lksIgo. A goose weighs 3 kg 200 g.

A duck weighs 1 kg 800 9.(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

Page 33: Singapore math gr 3 textbook 3 b

8. The totol weight of o pocket2 k9 4OO 9.lf the pocket of flour weighs+L^ ^^ -1.^+ ^f -^l+Lr rE PuLr\EL (Jr >urL.

of flour ond q pocket of solt is

1 kg 950 g, find the weight of

2k940Og

9. The totol weight of olf the weight of eochthe footboll.

1kq9509

footboll ondtennis boll is

10 tennis bolls is 1 kg.60 9, find the weight of

6og

Weight of 10 tennis bolls = 60 x= 600

Weight of the footboll - 1 kg

=lg

10

I-6009

10. The totol weight of o tin of cooking oil ond 2sugor is 5 kg 50 g.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 =

TT

pockets of

find the

Kg

32

kglgf;il;;;; \

Page 34: Singapore math gr 3 textbook 3 b

1. Write in 9roms.(o) s ks

PRACTICE 38

2.

1k99509 1kg60g(b) (.)(f) 3k929(d) 2 ke 80s e 2k959

Write in kilogroms ond groms.(o) 1s0s s (b) 10ss s(d) 33e0 s (e) 3sss s

II

(c)(f)

22085002

3. Add or subtroct in compound units.(o) 2ks9409+300s (b) 3k98809+1kg22osG) aks-1ks480s (d) skg20s-2ks45o9

AB

Find the totol weight of the two porcels.Find the difference in weight between the two porcels.

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

(o)(b)

t.

lf Ali's weight is 46 kg 540 g, find Somy's weight.

6. Roju's weight is 70 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 heovyMingli weighs 27 kg lessWhot is Mingli's weight?

os Dovid.thcn Hosson.

33

Page 35: Singapore math gr 3 textbook 3 b

REVIEW AFind the volue of eoch of the following:

1. 4992. 7503. 534. 87

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 greenore there?

(b)

+

(o)

+

(c)

4214575

5071806

156104

35938258

30847009

407324

+63-5x4+6

8.

9.

buttons

There were l50 bulbs in o6 of them were broken.The rest were pocked intoHow mony boxes of bulbs

box.

boxes of 4 bulbs eoch.were there?

Mr Wong bought threeThere were 36 orongesThere were 54 orongesHow mony oronges did

boxes of oronges.in the first box.in eoch of the other two boxes.he buy?

10.

Page 36: Singapore math gr 3 textbook 3 b

1. (o)

(c)

(e)

4m8cm-I..3km5rn=lm2 kg B0 g=lg

32Ocm -!m lcm1850m=lkmlm2OO4m-lkmlm

=lks ls=lks ls

Add or subtroct in compound units.

3. (o) 1m58cm+7Ocm (b)(c) 3m-2m35cm (d)

km690m+520mkm42Om-780m

4kg92Og+1259 3k97609+4kg35Og6kg-4kg82Og 4k9259-2k923O9

The totol weight of the fruiLs is | 9.If the opple weighs 90 9, find thetotol weight of the two peors.lf the peors ore of the some weight,find the weight of eoch peor.

3095 9

4209 9

2m4m

(b) 7 km(d) 8 km

59

a. (o)(c)

s.(c)(c)

6 (o)(b)

(c)

(b)(d)

REVIEW B

Find the missing numbers.

5m-lcm2km560m=lm1k930g=lg

2. 208cm -lm lcm(o)

(b)

(d)

(f)

(b)

(d)

(f)

95cm+2m45cm5Cm-lm65Cm

960m+2km24Om30m-3km4B0m

35

Page 37: Singapore math gr 3 textbook 3 b

Copccity

Litres qnd MillilitresHow much woter is there in eoch of these beokers?

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

WffiffiW

36

Page 38: Singapore math gr 3 textbook 3 b

1.

WW.W,W WW1fl

1f=10O0ml

Cet some poper cups.Find out how mony poper cups youcon fill with 1 litre of woter.

WW2. Cet o poil.

Find out how muchcon hold.

woter the poil

The bottle holds 2 litres of worer.

Its copocity is I litres.

3.

37

F,n".-;;; \

Page 39: Singapore math gr 3 textbook 3 b

The cqpocity of o contqineris the omount it con hold. We meqsure copocity in

litres qnd millilitres.

4. (o)

(c)

(b)

-

The copocity of the mug is I ml.

-

The copocity of the bottle is I ml.

D

The copocity of the jug is I f I ml.

'OeSg(

38

Page 40: Singapore math gr 3 textbook 3 b

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.

[*"*ffi**;"i;-

6. Find the totol omount of woter in these two beokers.

700m| +400m| -lml=lzlml

7. Write '1500 ml in litres ond millilitres.

1500mt =lrlml

8. Write in litres ond millilitres.(o) 1200 ml (b) 2s00(d) 100s ml (e) 3a00

9. (o) Write 2 f in millilitres.

2 ( -lml(b) Write 2 ( 35O ml in millilitres.

2(3sOml -lml

(c)(f)

mlml

2050 ml3105 ml

5mm

39

Page 41: Singapore math gr 3 textbook 3 b

10.

11.

Write(o) 1

(d) 3148Oml245ml

in millilitres.{ 800 ml425ml

8ml500 ml

(b) (c) 1a(f) 3(

12.

Eoch pocket contoins 250 ml of milk.

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

WWWWHow mcny millilitres more woter ore needed to moke up2litres?

13.

Which contoiner con hold more woter?How much more?

40

@b".r*d;;at\

Page 42: Singapore math gr 3 textbook 3 b

14.

1l800mlA

(o) Find the totol copocity of the

3{350m|tt

two contoiners.

1{8OOml +3{350rnt =lrlThe totol ccpocity is I f I ml.

(b) Find the difference in copocity between the twocontoiners.

o

3{350ml -1(The difference in

8OOmt =lrlmlcopccityislflml.

41

[;;il;.*"*,,.-\

Page 43: Singapore math gr 3 textbook 3 b

PRACTICE 4A1. Write in millilitres.

(a) 3 t (b)(d) 2 e 6so mt (e)

200 ml65 ml

55 mi5ml

1 Write in litres ond millilitres.(o) 5000 ml (b) 1600(d) 320s ml (e) 2074

3. Circle

@) 2e(f) 4r

1(34

(c)(f)

mlml

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.

4. Add or subtroct.(a) 1 t s00 ml + s00 ml (b)(c) 3 c 300 ml + 750 ml (d)(e) 24 800m| -1{780m| (f)G) at BOml -11360m| (h)

248OOml +1{200m|5/900ml +3(24Oml4(-1(85Oml6{5mi -2(80ml

5. The toble shows the copocities of four contoiners.

(o,/h)(c\

Which contoinerWhich contoiner

hos the greotesthos the smollest

copocity?copocity?

Whot is the totol copocity of the four contoiners?

42

Page 44: Singapore math gr 3 textbook 3 b

PRACTICE 481. 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 contoinerif 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?

Page 45: Singapore math gr 3 textbook 3 b

Find the volue of eoch of

REVIEW C

1. 8952. 14363. 774. 900

(o)

5. Mr Chen received $504 for selling pensHow mony pens did he sell?

6. Mr Wu poid $628 for o television set ond 91485 foro 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 peonuteoch box.How mony cookies were there oltogether?

Mr Li sold 337 pockets of biscuits lost month.He sold 299 more pockets this month thon lostHow mony pockets of biscuits did he sell in themonths?

(c)

2846 + 7545362 -26

123 x5518-8

ot $8 eoch.

cookies in

monfn.two

the following:

(b)

so3743742

64093002

t3408

+ 399

-78x9+3

8.

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

Page 46: Singapore math gr 3 textbook 3 b

O Bor Grophs

Grophs

;@"2 (4

Kt*-fl4ja

four boys.This picture groph shows the number of fish cought by

boy cotch?

ffi

..

.

ton"i.

Somy Yonghuo

How mony fish did eoch

Page 47: Singapore math gr 3 textbook 3 b

This bor groph shows the some informotion.

Numberoffish

12

10

8

6

4

2

0Minghuo 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

Page 48: Singapore math gr 3 textbook 3 b

1. This bor groph shows Rohim's exominotion results for foursu biects.

100

70

60

Morks 50

40

30

MothemoticsScience Moloy

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

(d)

(f)

(s)

Englilh.

He hod the some score in I ond l.

90

80

20

10

English

He scored 10 more morks in I thcn in Mothemotics.

His highest

His lowest

score wos in l.score wos in !.

47

Page 49: Singapore math gr 3 textbook 3 b

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

Moy

June

Julv

Aug ust

010203040506070Amount in dollors

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 inAugust?

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

4A

Page 50: Singapore math gr 3 textbook 3 b

3. This bor groph shows the number of books reod by five

children in o yeor.

80

70

Number 60of books

50

40

30

20

10

0Dovid 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

Page 51: Singapore math gr 3 textbook 3 b

4. This borbook foir

Numberof visitors

g rophfrom

shows theMondoy to

number of people who visited oFridoy.

500

450

400

350

300

250

200

150

100

50

0Mon 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 Fridaython on Thursdoy?

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

(d) On which doy were there os mony visitors os onMondoy?

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

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

50

Page 52: Singapore math gr 3 textbook 3 b

O Froction of o Whole

o whole

How monv fifths ore there in o whole?

o whole

How mony eighths ore there in o whole?

51

Frqctions

2 fifths

3 eighths

Page 53: Singapore math gr 3 textbook 3 b

1.

(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.

3 = | tifths

(c) lwhole=Ififrhs

t=l5

2.

,.3(oj 8 or tne Dor ts shoded.

I of the bor is not shoded.

(b) lwhole-leighths

t=I8

(c) Jondlmokelwhole.52

Page 54: Singapore math gr 3 textbook 3 b

3. Whot froction of eoch shope is shoded?

(o) (b)

(h)

53

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

Page 55: Singapore math gr 3 textbook 3 b

4.

3 ^.In tne Troct|on t, 5 ts tne

denominotor.Nome the numerotor ondfroctio ns.

)(oJ ;)

5. Which is greoter,

6. Which is greoteri

numerotor

denominqtor

numerotor ond 4 is the

denominotor of eoch of these

(c) (d)

3<-4<-

(b) 410

-or !53

or -<

?(or -t88

otq7

7. Which is greoter;

54

Page 56: Singapore math gr 3 textbook 3 b

The froctions ono nove o common numerotor.3

10

33i'7JO

19

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

.,, 2 2 2tnl\'t -l

CO./l(A\111\"/ r1'

workbook ExeKces 29 & 30

It is eosy to compore froctions whenthey hove o common numerotoror o common denominotor.

Page 57: Singapore math gr 3 textbook 3 b

'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.1C(n) - fh) " t'c'\.", 3 .', 10 \'./

3. Nome theq

(o) iat

PRACTICE 6A

Which

.,2(oJ ;f

froction

4or -5

I5

). wntcn rroc on rs

-72(o) or.-10 l0

denominotor eoch froction.

(b)

'1 whole

l l

(.)

(c)

(c)

of4;

4.

9

n

22

7

10

33or-85

g reoter?

@:

smoller?

(b) :1

or10

1or6

6.

7.

Which is

,.4\o) j'

Which is

(o) l.'' 6

the greotest

15j'j

the smollest

14.,;t)t)

froction?

(b)

froction?

111

3339' 5' 1O

56

(b)

Page 58: Singapore math gr 3 textbook 3 b

O Equivolent Froctions

Fold o piece of poper intoShode 1 port.

2 equol ports.

I of tn" poper is shqded.

Fold the poper cgoin.

2 ..,; oT rne poper rs snooeo.

Fold the poper ogcin.

2 out of4 equql pqrts

o

4-;ul15

the poper is shqded.

12rne rrocuons t, 4 ono

denominqtors.But they cre equol.

,1

8hqve different numerotors ono

{;i\2 eouql Dqts l

4 out of8 equol

57

Page 59: Singapore math gr 3 textbook 3 b

48

?1

t12t'4 ono !

8ore equivolent froctions.

W

] of the bor is shoded.

ro)l=! w.", 3

(b) z-l39

zlW

W

more equivolent froctions of ?.3'

(.)5 t2

Nome some

Nome some more equivolent

.1rrocuons or

(d)

58

Page 60: Singapore math gr 3 textbook 3 b

Whot

(o)

2. ore the missinq numerotors ond denominotors?

3

x31 ',--\ 3

3 ..-___, 6x2

x2'I',--\

x33

3.

To find on equivolent froction, multiply the numerotorond denominotor by the some number.

numerotor o enomtnotor.rd

IFind

(o)

(d)

(c)

(f)

10

6

the missing

1_l ,'- 2\u./ ; -34

1

12

3

9

6

5

3(e) l)

59

Page 61: Singapore math gr 3 textbook 3 b

4. Whot ore the missinq numerotors ond denominotors?

+48.'--\ 2

12

+28 ,-1

12 .-t 6+2

12 ',---t+4

numerotor or denominotor.5. Find

(o)

(d)

the

8

10

6

(.)

(f)

(b) 1= 9

10

^r"wr -tz

8 3

5{e)"12 12

6. Complete the following equivolent froctions

261

The simolest eouivolent frqction of

TII

12

6ts't2

To find qn equivolent froction, divide the numerotorond denominqtor by the some number.

60

Page 62: Singapore math gr 3 textbook 3 b

7. Express

',2\o) +

(e) 1"12

eoch of the

(b)

(f)

following

I8

!6

froctions

(c) a10

(o) 19"' 12

simplest form.?(d) :

rh) :., 1o

in its

8. Which is grecter,

9. Which is grecter, 7,'10

1O. Which froction is greoter?tq?

(oj -, - (Dl ^.5045

11. Which froction is smoller?

.,4 7 .,, 11(o) s' 10 (oi r j'

12. Arronge the froctions in oroer,

\",, g, 2' 4

beginning with the smollest.??')

{Dl'' 10' 5 5

?qor4A

2

aot

34;'-

1

t

23;,;5l

I6

(c)

(c)

61

Page 63: Singapore math gr 3 textbook 3 b

PRACTICE 581. Find

(o)

(d)

2. Find

(o)

(d)

the

1

the missing

2_ 4

denominotor

ch of the following:

(c)

(f)4

eoch of the

(.)

(f)

In eo

I r_I(b)

(")9

2(b) ;=

TO OWTnq:

9

I10

tn

9 6

!5

!8

3

1

T3

9

n2;

I5

I3

12

greoter

7

10

5

6

(e) 6

froction.q

(b) ;,?

10(cJ ;,tz?(f) :,)

3.

4.

Ring the?

ro) i,@:,

Arronge thefrcction.

tol"772'ltal5Z

5. Meiling ote

Suchen ote

Who cte c

lroctions in order, beginning with the smollest

(d)

2.; or o pre.o

1 ..,or tne Dre-2

bigger portion of the pie?

62

111s' t' 10

215a'4'n

I7

I6

(b)

missing numerotor

8

It)

I6

I3

1

5

6

4

4

I,l

5

6

Page 64: Singapore math gr 3 textbook 3 b

1.

2.

3.

4.

5.

6.

7.

8.

9.

(o) How mony(b) How mony

Find the missing

rl'"' 4 i2

Ring the smoller

11(oJ a' 42qrd) j. .

$10 notes con you get for $200?5C coins con you get for $1.50?

numerotor or denominotor.

,', 2 6

I (c)

froction.

,,, 2\D) j'

',2f

10 11tat -

tTl

I7

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 theonswer 44?

10.

63

Page 65: Singapore math gr 3 textbook 3 b

11. Find the missing numbers.

(o) 4m20cm-lcm(c) 2km9sm=lm(e) 1ks409 =19(g) 3t 60ml -lml

(b)

(d)

(f)(h)

1600

2450

2O5cm -lmlcmm =lkmlms =lksls

2525m|=lrlmt

tz. John bought 6 peors.He gove the coshier $5.How much chonge did he receive?

t5- A bodminton rqcket costs $9.60.A tennis rocket costs 538.40.How much more is the cost of the tennis rocket thon thecost of the bodminton rocket?

14. The tub contoins 1 litre of ice creom.Peter ond his friends eot 325 ml of it.How much ice creom is left?

15. Solly bought 10 pockets of milk.Eoch oocket contoined 125 ml of milk.Find the totol omount of milk in litres ond millilitres.

.416. Muthu spent 9 of his pocket money ond soved the rest.

Whot froction of his pocket money did he sove?

?17. Minghuc spent ] of his money on o book ond the Test on o

/rqcKet.Whot frcction of his money wos spent on the rocket?

Page 66: Singapore math gr 3 textbook 3 b

Time

Hours ond Minutes

20 minutes post 8 25 minutes to 9

Dcvid storted running ot 8.20 o.m.He rcn 3 km.He finished ct 8.35 c.m.He took'15 minutes to run 3 km.

65

Page 67: Singapore math gr 3 textbook 3 b

We reod 8.20 os eight twenty. 8.2o is 20minutes ofter 8 o'clock. We sqy the time is

twenty minutes post eight.

We reqd 8.35 os eight thirty-five.6.5) tS Z) mrnures Delore v o ctoct-.We soy the time is twenty-fiveminutes to nine.

1. Find out how mony times you con write your nome in 1 minute.

Whot time is it?

66

tGil*"-* \

Page 68: Singapore math gr 3 textbook 3 b

I

o.m. meons ofter '12.00

p.m. meons ofter 12.00midnight ond before '12.00 noon.noon ond before 12.00 midnight.

3. Whot time is 25 minutes ofter 9.30 o.m.?

4. How mony minutes ore there in t hour?

67

Page 69: Singapore math gr 3 textbook 3 b

5. (o) How mony minutes ore there from 1.15 p.m. to 1.42 p.m.?

(b) How mony hours ore there from 3.18 p.m. to 8.18 p.m.?

(c) How long is it trom 9.15 o.m. to 11.30 o.m.?

t hour = 60 minutes

The hour (h) ond minute (min) ore units of time.

68

t;,k""*;;; \

Page 70: Singapore math gr 3 textbook 3 b

6. The toble shows thepicture.

Who tookWho took

Write in minutes.(o) 2h(d) 3h

time token by 3 children Lo paint o

rnethe

(o)rhl

longest time?shortest time?

Nome

7. Mory took t h 35 min to complete o jigsow puzzle.

\ '1 h=60min

--.r-_--o

8.

9.

(b) 2(e) 3

nn

h

n

(c)(f)

10 min5 min

45 min15 min

(c) 2(f) 3

set of cu rtoins.ond minutes.

Mrs Lin sewed 4 sets of curtcins.She took 50 minutes to sew eocnFind the totol time token in hours

,--li;-.-180 min )20 mi

50minx4=200 min = I

200 min

hlmin

Write in hours ond(o) 70 min(d) 125 min

minutes.(b) 8s min(e) 160 min

100 min210 min

l8omin=Ih

10.

69

Page 71: Singapore math gr 3 textbook 3 b

11. A plone left Singopore ot 8.00 o.m.It orrived in Penong ot 9.05 o.m.How long did the journey toke?

The journey took I h I min.

Mrs Fu went to morket ot 7.15 o.m.She come home t h 45 min loter.When did she come home?

She come home ot I o.rn.

Solly took t h 10 min to do her homework.She finished doing her homework ot 9.40 p.m.When did she stort?

12.

t5.

Whot timethl0minbefore 9.40 p.m.?

Whot time isth45minofter /. tl o.m-a

She storted ot I p.m.

70

Page 72: Singapore math gr 3 textbook 3 b

14.

10.45 o.m. 12.00 noon 2.00 p.m. 3.3O p.m.

(o)

(b)

2.00 p.m. is I h ofter 12.00 noon.

3.30 p.m. is I h I min ofter 12.00 noon.

10.45 o.m. is I h I min before 12.00 noon.

15. A supermorket is open from 10.15ooy.How long is the supermorket open

o.m. to 9.30

o doy?

p.m. every

'10.15 o.m. 12.00 noon 9.30 p.m.

th45min th30min

t h 45 min +9 h 30 min =l h I min

The supermorket is open I h I min o doy.

71

Page 73: Singapore math gr 3 textbook 3 b

to.9.10 p.m. '12.O0 midnight 4.00 o.m. 6.40 o.m.

9.10 p.m. is I h I min before 12.00 midniqht.

A night tour begonWhen did the night

islhislh

(o)

(b)

(c)

4.00 o.m.

6.40 o.m.

ofter 12.00 midnight.

I min ofter 12.00 midnight.

ot 10.30 p.m. ond losted 3 h 20tour end?

3h 20 min

17. mtn.

1O.30 p.m. '12.O0 midnight 1o.n,..

3 h 20 min - t h 30 min = I h I min o"

The night tour ended ot I o.m.

't h 30 min

subtrqct.40 min +15 min -25 min +50 min -

(b)(d)

min (f)min (h)

3h2h2h15th35

or2h3hth3h

18. Add(o)(c)(")(s)

2h20min+45min3h5min-30min2 h 40 min +2h25 min3h20min-1h40min

72

t -*t""***" * \

Page 74: Singapore math gr 3 textbook 3 b

PRACTICE 7A1. Add

(o)(c)(")

su btroct.45min+2h15 min + 45 min30min+1h50min

to repcir both vehicles?he toke to repoir the van thqn

mtn

(b) 3h(d) 3h(f) 2h

orth2hth

40 min --1h4510 min -

2hminth30

2. This clock is

Whot is the5 minutes slow.correct time?

3. How long is it?(o) From 4.4O o.m. to 11.55 o.m.(b) From 5.45 p.m. to 7.00 p.m.(c) From 10.05 p.m. to 12.00 midnight(d) From 2.4O p.m- to 3.25 p.m.

4. Mr Chen took 2 h 35 min to repoir c vcn ond t h 55 min torepoir o cor.

(o) How long did he toke(b) How much longer did

the cor?

5. Chondron took 2 h 30 min to point his room.He begon ot 9.20 o.m.Whot time did he finish pointing his room?

5. A group of children left for on excursion ot 8.30 c.m.They returned 4 h 10 min loter.Whot time did they return?

7. A supermcrket opens for business ot 9.30 o.m.Its workers hove to report for work 40 minutes eorlier.Whot time must the workers report for work?

73

Page 75: Singapore math gr 3 textbook 3 b

O Other Units of Time

3.20 3.20 qnd 10 seconds

1.

f'-RL,'?\

-_

3.20 ond 50 second' \-}|,',

1 minute =

(ol flno ouL now mony mes

60 seconds

you con skip in'10 seconds.

(b) How long(c) How long

you tokeyou take

write the wordrun 100 m?

SINCAPORE?oooo

toto

74

.j- _",

Page 76: Singapore math gr 3 textbook 3 b

The hour (h), minute (min) ond second (s)qre units of time.

th=60min'1 min=60s

2. (o) Write 3 min 40 s in seconds.

3min40s=ls

(b) Write 150 s in minutes ond seconds.

15Os=lminls

(o) l yeor-I months(b) 2yeors-lmonths(c) 2 yeors 4 months-l months

(d) 40 months - | yeors I months

4. (o) lweek=Idoys(b) 3weeks-ldoys(c) 3weeks 4 doys= | doys

(d) 30 doys - | weeks I doys

3.

Fil;;;;'--\

'.:" - . - '":',, ..

Fil;;;;;;\

Page 77: Singapore math gr 3 textbook 3 b

PRACTICE 78

(o)

(f)(s)(h)

1. Find the missing numbers.

2h12min-lmin (b) 108min=lhlmin2min3s=Ir (d) 94s*lminlslyeorgmonths=lmonths30 months - | yecrs I months2weeks5doys=ldoys40cioys-lweekslcioys

2. The flying time from Singopore to Bongkok is t h 35 minond from Singopore to Monilo is 3 h 15 min.How much longer does it toke to fly to Monilo thon toBcngkok?

3. A bookshop is open from 9.30 o.m. to 5.00How long is the bookshop open?

4. Mrs Mo went shopping ot 10.20 o.m.She returned home 4 hours loter.When did she return home?

5. Devi completed o jigsow puzzle in t h 6 min.Lily completed the some jigsow puzzle 10 minutes foster.How long did Lily toke to complete the jigscw puzzle?

6. Mr Li ond his fomily went to Chongi Beoch for o picnic.They left home ot 8.30 o.m. ond orrived ot Chongi Beoch ot9.15 o.m.How long did the journey toke?

7. Mr Chen took 8 h 45 min to drive from Singopore toKuolo Lumpur.He orrived there ot 2.15Whot time did he leove

p.m.Singcpore?

Page 78: Singapore math gr 3 textbook 3 b

REVIEW E

1. Whot(o) 8(b) 1

2. Write

(o)

time is it?h 55 min ofter 12.00 noonh 30 min cfter 12.00 midnight

the missing numerotor or denominotor.

(b) (c)

3. This groph shows the number of vehicles in o cor pork.

50

40

Numberof 3o

vehicles20

10

0Motorcycle Bus Cor Von

(o) How mony more vons thon buses were there?

(b) lf there were 90 porking lots for ccrs ond vons, howmony of them were not occupied?

4. Mr Chen stoyed in Jopon for 19 months.Mr Lin stoyed there for 2 yeors 4 months.Who stoyed longer?How mony months longer?

10

77

Page 79: Singapore math gr 3 textbook 3 b

5.

6.

A mcchine con fill 140 jors of jom in 10 minutes.How mony jors con it fill in 1 minute?

An ort lesson stortedIt losted 45 minutes.When did the lesson

ot 5.40 p.m.

end?

7. A tonk con hold 10 times os much woter os o Doil.

9.

10.

11.

The copocitv of the tank is 60 litres.Whot is the ccpocity of the poil?

8. A piece of ribbon 1 m long is cut into two pieces.(

une prece rs m rong.

Whot is the length of the other piece?

Mr Fu bought o toothbrush ond oA toothbrush cost $6.50.A tube of toothposte cost $1.80.How much did he poy oltogether?

Mr Wu hod o box of mongoes.After giving 3 mongoes eoch to 1620 mongoes left.How mony mongoes were there in

Fotimoh spent $4.80 on strings ondmoke o flowerpot honger.How much did it cost her to moke c

12. Mrs Chen bought 8 towels.She gove the coshier $50 ond received $2 chong(o) How much did she poy for the towels?(b) Whot wos the cost of 1 towel?

tube of toothpcste.

children, he hod

the box ot first?

$2.50 on beods to

flowerpot hcnger?

7A

e.

Page 80: Singapore math gr 3 textbook 3 b

@ nnglesUse two cords to form on cngle like this:

Then mokeWhot is theCompore it

Geometry

o bigger ongle.biggest ongle you con get?

with your friends'.

Which cngleWhich ongle

the smollest?the biggest?

IS

t5

Page 81: Singapore math gr 3 textbook 3 b

1. Here ore some exomples of ongles.

2.

Look for some

Two sides of a

more ongles oround you.

triongle moke on ongle.

A triongle hos I sides ond ! ongles.

3. Here ore some 4-sided figures.How mony ongles does ecch figure hove?

c

l=;ilr;;;-..80

Page 82: Singapore math gr 3 textbook 3 b

O Right AngtesFold o piece of poper twice to moke on ongle like this:

one.

find out which of

The ongle you hove mode is o speciolIt is o right ongle.Use the right ongle you hove mode tothe following ongles ore right ongles.

Use the right ongle youoround you-

hove mode to

81

Iook for right ongles

Page 83: Singapore math gr 3 textbook 3 b

1. How mony right ongles(o) o squore

con you find in(b) o rectongle?

2. Which one of these triongles hosWhich one hos on ongle which isright ongle?

o right ongle?greoter thqn o

3. How monyHow mony

ongles does eochore right ongles?

of these figures hove?

a2

Page 84: Singapore math gr 3 textbook 3 b

O Areo

Moke 4 squore cords ond 4 holf-squore cords.

ffiffiffiffi AAAAUse the cords to moke different fiqures like these:

The fig u res hoveThe oreo of eoch

tne some (lre(t.figure is I squore units.

Eoch I is'1 squqre unit.

Eech A is I sguore unit.

83

Page 85: Singapore math gr 3 textbook 3 b

of the following figures?

WWMw"*-^

B

1. Whot is the oreo of eoch

Which figureWhich figure

hos the smollesthos the greotest

oreo?o reo?

a4

Page 86: Singapore math gr 3 textbook 3 b

2. This is o 1-cm sq uo re.

1cm

squores ln squore

o 4-cm sq uo re

Eoch side of theis 1 cm long.

,.".lm

Its orec is 1 squore centimetre (cm2).

Cive the oreo of eqch of the followingcentimetres.

lcm

o 2-cm squore

5-cm sq uo re?'1O-cm squo re?

85

o 3-cm sq uo re

The squore centimetreq unit of oreq.

A 2-cm squore is mode up of4 pieces of 1-cm squores.Its oreo is 4 cm2.

3. (o)(b)

WhotWhot

oreo oforeo of

is theis the

o

Page 87: Singapore math gr 3 textbook 3 b

4. This figure is mode up of 1-cm squores.Find its oreo.

1cm

5. Whot is the oreo of eoch of the following figures?

,.",.1

lcm

M

W

W w{

M MM Mk*

W A W

M Fnt W

M /, L

85

l-;,kb-k ""'.ts*" \

Page 88: Singapore math gr 3 textbook 3 b

6. Eoch side of this squore is 1 m long.

1mTV:,+nnm

1^l1:ii!,/::i,,ii.Il.l!iItt'!n

Its oreo is 1 squore metre (m2).

Cive the oreometres.

of eoch of the following figures in squore

w

Which figureWhich figure

hos the greotest oreo?hos the smollest oreo?

'1 m

cBA

1m 1m

87

t;;"k*;; \

Page 89: Singapore math gr 3 textbook 3 b

PerimeterSumei usedthe triongle,

3 pieces of wirethe squore ond

of the some length to mokethe rectongle.

1cm

They hove the some perimeter.The perimeter of eoch figure is I cm.

Page 90: Singapore math gr 3 textbook 3 b

1. Meosure with threod, the perimeter of eqch of thesefigures.

2.

Which figure hos o longer perimeter?

(o) Meosure the perimeter of your textbook in centimetres.(b) Meosure the perimeter of your clossroom in metres.

These two figures ore mode up of the sqme number of 1-cmsq uo res.

(o) They hove the some oreo.

The oreo of eoch figure is I cm'Z.

(b) They hove different perimeters.

The perimeter of Figure A is I cm.

The perimeter of Figure B is I cm.

Y

3.

BA

89

Page 91: Singapore math gr 3 textbook 3 b

4. These figures cre mode up of 1-cm squcres.

(o) Do they hove the some oreo?(b) Do they hove the some perimeter?

5. These figures ore mode up of l-cm squores.

Dc

WP

(o)

(b)

(c)

Which two figures

Which two figuresdifferent oreos?Which two figures

oreo but different

perimeter but

oreo ond perimeter?

hqve the

hove the

hove the90

some

some

some

Page 92: Singapore math gr 3 textbook 3 b

6. (o) Eoch side of the squore is 6 cm long.Find its perimeter.

Perimeter=6+6+6+6- 1..

(b) The length of the rectongle is 12 cm.Its breodth is 4 cm.Find its perimeter.

Perimeter =12+4+12+4 4'

- 1.'n

7. Find the perimeter of each of the following figures:

6cm

6cm

12 cm

'10 cm

9m

tlm

8cm

'16 m

91

T--"*bfi;*; -\

Page 93: Singapore math gr 3 textbook 3 b

@ Rreo of o RectongteFind the oreo of eoch of the followinq rectonqles:

I count the squqre unitscovered by eoch rectongle to

Areq of rectongle = Length x Breodth92

I multiply the length ondbreodth of eoch rectongleto find its qreo.

Page 94: Singapore math gr 3 textbook 3 b

1.

2. Find the oreo of eoch of

(o) 1cm

(.)

(e)

8cm

Find the oreo of the rectongle.

Araa a{ tar+anala

=5x4= | squore units

1.,"1

the following rectongles:

(b) 1cm

1cm

(d)

1cm

6cm

93

Page 95: Singapore math gr 3 textbook 3 b

PRACTICE 9A1. Find the oreo ond the perimeter

rectongles ond squqres:of eoch of the following

17 cm

5cm10 cm

cm

6cm

2. The length of the photogropis 15 cm.Its breodth is 10 cm.Find its oreo.

I10

3. The Iength of o rectongulor fieldis 10 m.Ali rcn oround the field once.How for did he run?

8m

94

is 85 m ond its breodth

Page 96: Singapore math gr 3 textbook 3 b

REVIEW F

1.

Eoch side of o triongle is 9 cm long.Find the perimeter of the triongle.

3. This groph shows the10

8

heights of the pupils in Mrs Lin's clo ss.

Numberof pupils

148cm 149cm 150cm 151cm 152cm

Study the groph ond onswer these questions.(o) How mony pupils ore 150 cm toll?(b) How mony pupils ore toller thon 150 cm?(c) How mony pupils ore in the tollest group?

4. Tom bought o wire ond cut it into 8 pieces.Eoch piece of wire wos 30 cm long.Find the length of the wire he bought.Cive the onswer in metres ond centimetres.

2500 people took port in o1360 of them were men.240 were children.The rest were women.

civil defence exercise.

(o) How mony women were there?(b) How mony more odults thon children

Arronge the froctions

,,3 'r s\o) 4' t' 8

in order, beginning with the smallest.

/h\II 3

10

2.

5.

148cm

95

were there?

Page 97: Singapore math gr 3 textbook 3 b

6.

l.

8.

Mrs Chen mode 286 cookies.She gove owoy 30 cookies ond sold the rest ot 8 for $1.

How much money did she receive?

Eoch side of o squore is 6 cm long.Find the crec of the squore.

Anno, Peter ond John shored o Pizzo.

Anno ond Peter eoch received ] of the pizzo.

Whot froction of the pizzo did John receive?

580 mPo rk

LibroryTom's house

Tom's house is 1 km from the Pork..How for is Tom's house from the librory?

10. (o) Whot is the totol weight of the3 pieces of butter ond thepocket of flour?

(b) lf ecch piece of butter weighs300 g, find the weight of the pocketof flour in kilogroms cnd groms.

9.

11.

(o)(b)

AWhich twoWhich two

B

hove the somehove the some

96

coreo?perimeter?

fig u resfig u res

Page 98: Singapore math gr 3 textbook 3 b