Singapore math gr 3 textbook 3 b
description
Transcript of 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
@ 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
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.
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
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
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
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 ',.*- \
@ 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
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
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
\
$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
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
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
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
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
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,*;; \
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
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
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
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
+.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
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
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
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.
'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 \
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
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*"*;",*;; \
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
More Word Problems
350 g
Weight of morbles = 1 kg 20O 9 - 350 9
2kg
t)P
lkg
w.=., .,: ::.::.11kg 20O g
=1929
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
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
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;;;; \
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
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.
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
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
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".-;;; \
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
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
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\
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;.*"*,,.-\
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
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?
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
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
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
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
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
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
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
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
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
3. Whot froction of eoch shope is shoded?
(o) (b)
(h)
53
tr,';;""".,*.*\
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
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.
'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)
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
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
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
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
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
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
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
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?
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
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*"-* \
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
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""*;;; \
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
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
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
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""***" * \
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
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- _",
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;;;;;;\
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?
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
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.
@ 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
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
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
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
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
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
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
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*" \
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*;; \
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.
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
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
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;*; -\
@ 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.
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
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
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?
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