standard four

STANDARD FOUR

TERM II

VOLUME 2

A Publication Under

Free Textbook Programme of

Government of Tamilnadu

NOT FOR SALE

Department of School Education

Untouchability is Inhuman and a Crime

SOCIAL SCIENCE

MATHEMATICS

SCIENCE

Textbook Prepared and Compiled By

Textbook Printing

College Road, Chennai - 600 006.

College Road, Chennai - 600 006.

iii

(1 - 54)

1. Measuring Capacity 3

2. Multiplication and Division 16

3. Calculating Time 36

MATHEMATICS

Chapter Title Page No.

CONTENTS

(93 - 131)

1. 95

2. 107

3. 111

4. 115

5. 123

Our Country

National Symbols

Rights and Duties

Lifestyles

Inventions

SOCIAL SCIENCE


1. Food 57

2. 67

3. 73

4. 81

Work and Energy

Personal Safety

Uses of Natural Resources


(55 - 92)SCIENCE

MATHEM

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1

MATHEMATICSSTANDARD FOUR

Term II

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2

Practice

What these Icons stand for!

REvISIon

PRojECTPuzzle

Lab activity

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3

MEASURING CAPACITY1 ReetaandhersisterGeethafilledwaterintwobucketsofsamecapacity.Theyuseddifferentmeasuresofjarstofill.

Measurescannotbeaccurateifweusenon-standardmeasures.

RamuandSomuwent to a juice shop.They boughtOrangejuiceandMangojuice.

Whohasmorejuice?Ramuhasmorejuice.

Somumayhavehalfofit.

Millilitreandlitrearethestandardmeasures.

500ml1l

Geetha filled the bucketby8jarsofwater.

Reetafilledthebucketby10jarsofwater.

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Relation between litre and millilitre

Teacher:Children,canyoutellmewhereyouhaveseentheseobjects?Sankar :Ihaveseenthesecontainersinthefairpriceshopto

measureoil.John :Ihaveseenthemwiththemilkman.Teacher:Yes,Youarebothcorrect.Thesejarsareusedfor

measuring liquid. Can you tell me the units used formeasuringliquids.

Mohan :millilitreandlitreTeacher:Gopu,pleasetakethe500millilitrejaranduseittofillthe

onelitrejarwiththewater.Thentellmehowmanytimesyouhadtousethe500millilitrejar.

Gopu :Ihadtofillit.Teacher:Weseethat,weneedtwo500millilitrejarsofwatertomake

onelitre 500millilitre +500millilitre=1litre

1000millilitre=1litre

1l

500ml 200ml

100ml 50ml

MATHEM

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5

Fill in the blanks :

50 ml

ml

200 ml

ml

ml

500 ml

500 ml

100 ml

200 ml

200 ml

1 litre

ml

ml

ml

ml ml

ml

+ ++ +

+ ++

+ ++

+ +

½ l = 500ml

¼ l = 250ml

¾ l = 750ml

wewrite‘ml ’ formillilitreand‘l ’ fo r litre

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Water, waterThe table shows the amount of water used in one day by Sriram’s family of 3 persons.

Drinking 9 l Cooking 12 l Cleaning vessels 15 l Bathing 30 l Washing clothes 24 l Other reasons 40 l

Total amount of water l used for one day

Find the amount of water used by your family in one day?

Name of the Student ......................................................

Total number of persons in your family ..........................

Drinking l Cooking l Cleaning vessels l Bathing l Washing clothes l Other reasons l Total amount of water l used in one day

ProjECT

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7

(1) Fill in the missing boxes.

1) 1 l = 1000 ml 5) 7000 ml = l

2) 2 l =ml 6) 4000 ml = l

3) 6 l =ml 7)9000ml = l

4) 5 l =ml 8) 3000 ml = l

A B

1l 250ml

1l 25ml

1l 5ml

1l 750ml

1l 705ml

B

1750 ml

1250 ml

1705 ml

1005 ml

1025 ml

ml ml ml

ml ml ml

ml ml ml

=

=

=

+

+

+

=

=

=

9)3l + 475 ml

10) 5 l + 60 ml

11) 7 l + 5 ml

(2) Write the correct matches of A from B.

Addition of litre and millilitre

2 l + 450 ml = 2000ml + 450 ml =2450 ml

3 l + 75 ml = 3000ml + 75 ml =3075 ml

4 l + 5 ml = 4000ml + 5 ml =4005 ml

Practice

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Fill in the boxes using 500 ml, 200 ml, 100 ml, 50 ml.

500 ml + +

500 ml 100 ml + 100 ml + 100 ml + 100 ml + 100 ml

700 ml + + +

200 ml + +

300 ml + + +

200 ml + + +

250 ml +

350 ml + +

450 ml + + +

600 ml +

1l + + +

Listoutthemeasuresusedinyourhomeforthefollowingitems. Milk,Juice,Buttermilk,Ghee,Coconutoil.

PRojECT

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9

Step1: Addmillilitres.Step2: Addlitres.

Addition in capacityAdd.

25l 500ml + 13l 225ml

l ml

25 500

+ 13 225

38 725

1) l ml 2) l ml 3) l ml

50 100 15 175 22 327

+29350+13225+13 256

4) l ml 5) l ml 6) l ml

16 200 7 050 43 000

15 150 12 200 14 500

+ 17 300 + 23 500 + 26 250

7) l ml8)l ml9)l ml

1830637150 3 075

16054 2221 19 529

+14252+44578+21 275

Practice

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10

Life related problems

Shallweprepareacolddrink?itisveryhottoday.Theingredientsaregivenbelow.

Totalquantityofthecolddrink=3l 700ml

1)Thesearethreevesselswithmilk.

17l 300ml 2l 100ml 5l 200ml � Whichvesselhasmoremilk?

� Whichhaslessmilk?

� Findthetotalamountofmilkinthethreevessels.

200mllemonjuice 2l 500mlcoldwater1l sharbath

l ml

Coldwater=2 500Sharbath =1 000LemonJuice=0 200Total =3 700

1 2 3

Practice

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2) Theamountofmilkgivenbyacowinthreedaysisgivenbelow. l ml

Day1 13 500 Day2 14 200 Day3 12 100

Findthetotalmilkgivenbythecowinthreedays.

3) Bamahas2lofbuttermilkwhich isverysour intaste.Soshe add 500mlofwater.Whatistheamountofbuttermilkaftertheadditionofwater?

4) Jayanthibuys1lofidlymix.Tomakedosasheadds200mlofwater.Findthetotalamountofdosamix?

5) 200mlofcoconutoil,300mlofsesameoiland100mlofcastoroilaremixedtolightalamp.Calculatethetotalquantityoftheoilmixture?

6) 50ml ofred,100mlofgreenand500mlofwhitepaintaremixedtogether.Findthetotalquantityofpaintobtained.

7) Thewaterusedtopreparefooditemsatafunctionaregiven below.

FooditemQuantityofwater

l ml

Rice 25 200Rasam 15 150Buttermilk 10 500Padamkheer 5 50

� Findthetotalquantityofwatertopreparericeandrasam.

� Howmuchquantityofwaterisneededtopreparebuttermilkandpadamkheer?

� Findthetotalquantityofwaterrequiredtoprepareallfooditems.

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Practice

Theclothesaresoaked.Waterinapot Remainingwater

11l 20l

Subtraction in capacity

Subtract.

15l 350ml – 13l 225ml

l ml

15 350

– 13 225

2 125

Life related problem

Findthequantityofwaterusedforsoakingtheclothes.

Thequantityofwater = 20l Remainingwater =- 11 l

Waterusedforsoakingtheclothes =9l

1) l ml 2) l ml 3) l ml

27 875 35 95056 357

–18 618 –23 286–15 238

Step1:Subtract225mlfrom350ml.

Step2:Subtract13lfrom15l.

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4) Findtheremainingmangojuicewhen200ml istakenfrom1l 500 ml ofmangojuice.

l ml

1 500 - 0 200

Remainingmangojuice =________

5) Rajaandhisfriendswenttoanoilshop.Thequantityofoil boughtbythemaregivenbelow.

Ö FindthetotalquantityofoilboughtbyElizabeth.

Ö Calculatethetotalquantityofsunfloweroilboughtfromtheshop?

Ö Whoboughtmoremustardoil?

Ö Whichoilwasboughtmost?

Ö HowmuchmoregroundnutoildidRajabuythanNithish?

S. No Name

Sun flower oil

Groundnut oil

Gingelly oil

Mustard oil

Coconut oil

l ml l ml l ml l ml l ml

1 Raja 5 000 1 300 3 000 0 100 0 050

2 Elizabeth 8100 0 250 1 100 0 300 0 100

3 Nithish 1 200 0 050 0 250 4 150 2 000

4 Revathi 4 150 3 100 2 600 0 050 --

5 Rajeswari 2 250 4 050 4 050 0 200 0 400

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Fillinthetable.

S. No Things Number of times

Approximate

value in l or ml

Correct value in

l or ml

1. 20

2. 5

3. 3

4. 1

5. 2

6. 1

7. 20

8. 1

9. 4

Lab activity

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Fill in the blanks.1) 7l + 500ml =______ml

2) 4l + 65ml =______ml

3) 8l + 5ml =______ml

4) 4l890ml =______ml

5) 6l856ml =______l +_____ml

6) 3l 567ml =______l+_____ml

7) 4l 890ml =______l +_____ml

Do the sums.1) 2) l ml 3) l ml

l ml 16 305 27 0057 075 7335586 290+75 354 +55089 + 73 605

4) l ml 5) l ml 6) l ml

82 235 7358998 439–28 150 –65254–39 315

7) A drum contains 54l 250ml of varnish and another drumcontains75l 650ml. Whatisthetotalcapacity?

8) A bucket contains 15l 20ml water and another bucketcontains12l 300ml. Whatisthetotalquantity?

9) Acurdvendorhas89l 500ml ofcurd. Ifhesells39l 250ml,

howmuchisleftwithhim?

REvISIoN

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MULTIPLICATION AND DIVISION2MuLTIPLICATIoN InaWorldCupCricketMatch,2007,YuvarajSinghhiteachballforasixrunsintheover.

Shall we calculate the runs taken by him in the over?Numberofrunstakenin

Solution:Tofindthetotalnotebookswehavetomultiply7by6.7×6=42

42notebookswillbeneededfor7students

Multiplication is the short form of repeated addition

6th table

oneball =6 =1×6=6twoballs =6+6 =2×6=12threeballs =6+6+6 =3×6=18fourballs =6+6+6+6 =4×6=24fiveballs =6+6+6+6+6 =5×6=30sixballs(oneover) =6+6+6+6+6+6 = 6×6=36

6notebooksareneededforonestudent.Howmanynotebookswillbeneededfor7students?

1×6=6

2×6=12

3×6=18

4×6=24

5×6=30

6×6=36

7×6=42

8×6=48

9×6=54

10×6=60

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5)Findthenumberoffansin9housesifeachhousehas6fans.

1×7=7

2×7=14

3×7=21

6×7=42

8×7=56

10×7=70

1)4×7=2)7×7=3)9×7=

4)Aboxcontains7pencils.Howmanypencilsaretherein5boxes?

5)Oneweekhas7days.Calculatethenumbersofdaysin8weeks.

Complete the 7 table

1)3×6=2)4×6= 3)5×6=

4)Ifashirthas6buttons,howmanybuttonswillbein8shirts?

Flowerhas7petals.

Practice

Practice

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Practice

1×8=8

2×8=16

3×8=24

5×8=40

7×8=56

10×8=80

Complete the 8 table

1)4×8=2)6×8=3)9×8=

4) Numberofrodsinawindowis8.Findthenumberofrodsin8

windows.

5)Findthenumberofpillarsfor7buildingsifeachbuildinghas8pillars.

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Practice 1)4×9=2)7×9=3)8×9=

5) Numberof idliesthatcanbepreparedinoneoneidlyplate is9.Howmanyidliescanbepreparedin9idlyplates?

Complete the 10 table. ` Changeto10table.

1×10=102×10=20

10×10=100

4) AKho-Khoteamhas9persons.Howmanypersonsaretherein6teams?

Complete the 9 table.

10×1=10

10×2=20

10×3=30

10×4=40

10×5=50

10×6=60

10×7=70

10×8=80

10×9=90

Fromthetables1to9weknowthefollowing.

=1×9=9=2×9=18= =4×9=36= =6×9=54==8×9=72==10×9=909+9+9+9+9+9+9+9+9+9

9+9+9+9+9+9+9+9+99+9+9+9+9+9+9+99+9+9+9+9+9+99+9+9+9+9+99+9+9+9+99+9+9+99+9+99+99

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1) 5 × 10 = 50

2) 60 × 10 =

3) 705 × 10 =

4)500 × 10 =

5)7 × 100 = 700

Whenanumberismultipliedby10,100,1000,itisenoughtowriteonezero,twozeros,threezerosrespectivelyafterthat

number.

Fill in the boxes

5×1=548×1=48760×1=760

Theproductofoneandanynumberisthenumberitself.

7×0=050×0=0384×0=0

Theproductofzeroandanynumberiszero.

1×2=2×127×5=5×27768×4=4×768

7× 8 = 56 = 8 × 7 5× 9 = 45 = 9 × 510× 7 = 70 = 7 × 10

7×6 =____ =6×7

____ =72 =8×9

9×9 =81 =____

6) 40 ×100=

7) 66 ×100=

8) 3 ×1000=3000

9) 8 ×1000=

10) 9 ×1000=

Multiplication by 10, 100, 1000

Multiplication by 1

Theproductoftwonumbersdoesnotchange,ifweinterchangetheorderofnumbers.

Multiplication by 0

order of multiplication

Fill in the blanks.

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Multiplication - Easy methods

Multiplicationby30,50...etc.

1. Multiply245by30

245x30 =245x(3x10) =(245x3)x10 =735x10 =7350 245x30 =7350

2. Multiply36by50

36x50 =36x(5x10)

=(36x5)x10

=180x10

=1800

Tomultiplybyanumber30,50.etcfirstmultiply

thenumberbythenon-zerodigitofthemultiplier

andputasmanyzerosasthereareinthemultiplier

totherightoftheresult.

Multiply

1. 27x40 2.34x80 3.65x90

4. 452x70 5.535x60 6.791x20

245x30 735 0

36x501800

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Practice

Srinath arranged 20 chocolates in the following ways.

1) 2)

3) 4)

2×10=20

10×2=20

4×5=20

8×3

24

6 × 4 4 × 6

3×8

12

1820

Complete the chart for the following numbers.

5×4=20

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Multiplication of two digit numbers by one digit number

Number of students in 6 classes = 204

If one class has 34 students, find the number of students in 6classes.

Solution: Numberofstudentsinoneclass=34 Numberofstudentsin6classes=34×6

Step1:

4×6=24ones

Write4inthe‘ones’place

andcarry2tothe‘tens’place.

Step2:

3×6=18tens

Add18tensand2tens.

18+2=20

Write0intensplaceand

2inhundredsplace.

2

H T O

3 4

× 6

4

2

H T O

3 4

× 6

2 0 4

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Multiplication of 3 digit numbers by one digit number

Thecostofaricebagis`436.Findthecostof7ricebags.

Solution:

Costofaricebag=` 436

Costof7ricebags=` 436 × 7

Steps :

� 6×7=42

write2inonesplaceandcarry4totensplace

� 3×7=21,21+4=25

write5intensplaceandcarry2tohundredsplace

� 4×7=28,28+2=30

write0inhundredsplaceand3inthousandsplace.

Cost of 7 rice bags = ` 3052

2 44 3 6

× 73 0 5 2

HTh T O

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1)67×6 2)95×5 3)47×8 4)87×5 5)897×6 6)725×7 7)506×7 8)923×8 9)666×8 10)460×9 11)292×5 12)788×9

13) Apearlnecklacehas52pearls.Howmanypearlsarethere in7necklaces?

14)Numberofrosesneededforagarlandis72. Calculatethenumberofrosesneededfor9garlands.

15) 485sugarcanebundlesareloadedinacart.Howmany bundlesareloadedin7carts?

16) Thecostofanironboxis`565.Findthecostof8ironboxes.

Multiplication of two digit numbers by two digit numbersAboxcontains48apples.Howmanyapplesarethere in56boxes?Solution: Numberofapplesinabox =48 Numberofapplesin56boxes =48×56

Number of apples in 56 boxes = 2688

Wecanwrite56=50+6

48×6ones288ones

48×50ones2400ones

Step 2 288+ 2 4 0 02688

Step 3Step 1

Practice

4 8× 5 6

2 6 8 8

2 8 82 4 0 0

HTh T O

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Numberofapplesin56boxes=2688.

1) 59×432)58×563)95×604)78×665)38×71

6)92×767)60×888)54×909)70×9210)65×98

11) Inamarriagehall28personsareseatedinarow.Howmanypersonsareseatedin36rows?

12)BusfareforapersonfromTambaramtoCuddaloreis`93.Findthebusfarefor43persons.

13) A Minivan is loadedwith44onion bags. Howmany onionbagsareloadedin37Minivans?

14) Onequireof paper contains24sheets.Howmanysheetsaretherein36quires?

15)HowmanyhoursarethereinthemonthofJuly?

PuzzleIamatwodigitnumber.Ilieinbetween40and50.Iamanevennumber.Iappearinsixthandseventh

multiplicationtable.WhoamI?

Another way

Multiplyonesbyones8×6=48Multiplytensbyones4×6=2424+4=2848×6=288

Multiplyonesbytens8×5=40Multiplytensbytens4×5=2020+4=2448×5=2400

4 8× 5 6

2 6 8 8

2 8 82 4 0 0

4 4Step 2Step 1

Practice

Step 3 288+2400=2688

HTh T O

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DIvISIoNSharingThereare20,21,22,23,24and25pomegranatesineachbox.Inhowmanyrowstheycanbearrangedifeachrowhas5pomegranates?

Arrange in groupsIf 42 students are to be grouped equally into 3 teams, howmanystudentswillbethereineachteam?

Divide : 42 ÷ 3

4rowsandremainder0

4rowsandremainder1

4rowsandremainder2

4rowsandremainder3

4rowsandremainder4

5rowsandremainder0

Quotient = 14Remainder = 0

42=30+12

14studentswillbethereineachteam.

10+4=14 3 30 + 12 30 + 12 0

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Division of three digit number by a one digit number

Division without remainderDivide875by7

875 ÷ 7 = 125 Quotient = 125, Remainder = 0

Findthenumberofplatesthataredistributedequallyto9hostelsifthetotalnumberofplatesare963.

Solution : Totalnumbersofplatesdistributed=963Numberofhostels =9 Numberofplatesdistributedtoeachhostel=963÷ 9

107 platesaredistributedtoeachhostel

1 2 57875 7 1 7 1 4 3 5 3 5 0

Step1: Take8hundreds.Divide8by7.

Quotient=1andremainder=1

Step2:Take17tens

Divide17by7.Quotient=2and

remainder=3

Step3:Take35ones

Divide35by7.Quotient=5and

remainder=0

Step1: Take9hundreds. 9÷9=1.Step2 : Take6tens. 6cannotbedividedby9. So,put0tensinquotient’splace. Nowtake63ones. 63 ÷ 9=7,remainder0.

1 0 799639 6 3 6 3 0

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Division with remainder Divide657by8

1) 575 ÷ 5 2) 336 ÷ 6 3) 456 ÷ 8 4)658÷ 7

5)807÷ 6 6)690÷7 7)981÷ 8 8)829÷ 9

9) Anelectricianfixed4bulbs inaroom. Inhowmanyroomscan

216bulbsbefixedbyhim?

10) 9saplingsareplantedinarow.Inhowmanyrowsare873saplings

planted?

Division of 4 digit number by one digit numberDivision without remainderDivide7847by7

Quotient=82Remainder=1

828657 6 4 1 7 1 6 1

Step1 : Take6hundreds.6cannotbedividedby8.Sotake65tens.Divide65by8.Quotient=8 andremainder=1

Step2 : Take17ones.Divide17by8.Quotient=2andremainder=1

1 1 2 177847 7 8 7 1 4 1 4 7 7 0

Step1 : Take7thousands.Divide7by7.Quotient=1andremainder=0

Step2 : Take8hundreds.Divide8by7.Quotient=1andremainder=1

Step3 : Take14tens.Divide14by7.Quotient=2andremainder=0

Step4: Take7ones.Divide7by7. Quotient=1andremainder=0

Quotient=1121,Remainder=0

Practice

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8childrencollected4904shellsfromtheseashore.Iftheshellsareequallyshared,howmanyshellswilleachoneget?

Division with remainderDivide7004by6

Quotient=1167 Remainder=2

Check: 1167×6=7002 addingtheremainder2 7002+2=7004

Step1 : Take4thousands.4cannotbe dividedby8.Sotake49hundreds. Divide49by8.Quotient=6and remainder=1

Step2 : Take10tens.Divide10by8. Quotient=1andremainder=2.

Step3 : Take24ones.Divide24by8. Quotient=3andremainder=0.

6 1 38490448 10 8 2 4 2 4 0

Solution :Totalnumberofshells=4904Numberofchildren=8Numberofshellsforeachchild=4904÷8

Eachchildwillget613shells.

1 1 6 76 7 0 0 4 6 1 0 6 4 0 3 6 4 4 4 2 2

Step1 : Take7thousands.Divide7by6.Quotient=1andremainder=1.

Step2: Take10hundreds.Divide10by6.Quotient=1andremainder=4

Step3 : Take40tens.Divide40by6.Quotient=6andremainder=4

Step4 : Take44ones.Divide44by6.Quotient=7andremainder=2.

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1 2 2 589805818 1 6 2 0 1 6 4 5 4 0 5

61895567 5 4 1 6 9 7 7 7 2 5

2x8=16

1x8=8

2x8=16

6x9=54

1x9=9

8x9=72



5x8=40

Practice

Divide9805by8 Divide5567by9

1) 5232 ÷ 6 2)8540÷ 7 3) 4624 ÷ 8 4)2340÷ 9

5)8348÷ 6 6) 6205 ÷ 7 7) 3426 ÷ 8 8)3352÷99) 6studentscanbeseatedinabench.Howmanybenchesare requiredfor6264students?10) Asixstoreybuildinghas2292rooms.Ifeveryfloorhasthesame

numberofrooms,howmanyroomsarethereoneachfloor?11) 7containershave7630mugsofwater.Howmanymugsofwater

arethereinonecontainer?

Observe and fill in the blanks.

42 ÷6= 7 56 ÷7=______ 81÷9=______

420 ÷6= 70 560 ÷7=______ 810÷9=______

4200 ÷6= 700 5600 ÷7=______ 8100 ÷9=______

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observe the following pictures and frame problems

Busfareforonepersonis`96.Findthefarefor5persons.

1.

2.

3.

4.

Onion 1kg ` 15

Potato 1kg ` 25

Tomato 1kg ` 12

Drumstick 1kg ` 30

Apple 1kg `80

Banana 1 ` 3

Problems

vegetable and Fruit stall

MATHEM

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33

Problem Totalcost`88

Problem Totalcost` 500

Problem

Costof6soapcakesare`132.Whatisthecostofasoapcake?

Totalcost` 132

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Practice

Estimation in multiplication

Atourismcompanycollected`85perheadforafieldtrip.Estimatetheamountcollectedfrom27persons.

ActualamountEstimatedamountAmountperhead = ` 85 `90 Amountfor27persons= `85×27 `90×30 595 00 1 7 0 2 7 0Amountfor27persons=`2295 ` 2 7 0 0

Differencebetweenestimatedamountandactualamount =`2700− `2295 Difference =` 405

Apersondelivers92newspapersinaday.Estimatethe numberofnewspapersthathedeliversin28days?

Estimate and calculate.

Numbers Actual value Estimated value Difference

45 × 12 540 50×10=500 40

92×18

26 × 22

33 × 37

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35

Multiply.

1) 62 × 4 2) 35 × 7 3) 42 × 6

4)89×8 5) 360 × 5 6) 402 × 6

7) 237 ×8 8)685×9 9)40× 27

10) 30 ×70 11)81×44 12)92× 53

13)Thecostofatoothpastepacketis`26.Findthecostof48tooth

pastepackets?

14)Alorryis loadedwith6cars.Howmanycarscanbeloadedin

450lorries?

Divide.

1) 72 ÷ 4 2)80÷ 5 3) 98÷ 6

4) 88÷ 8 5)654÷ 5 6) 342 ÷ 6

7) 530 ÷ 7 8)632÷ 8 9)458÷ 9

10)8505÷ 5 11) 5437 ÷ 6 12) 6027 ÷ 713)If6notebookshave9120 lines,howmany linesarethere ina

notebook?14)If 9 ice cream cups are placed in a tray, howmany trays are

neededfor504icecreamcups?

15) Findthequotientandremainderforthefollowingdivisions. 1.2519'1 2.2519'2 3.2519' 3

4.2519' 4 5.2519'5 6.2519' 6 7.2519'7 8.2519'8 9.2519'9

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CALCULATING TIME3

Twofriendsstudyingindifferentschoolsareconversingwitheachother.

Atwhattimedoesyourschoolstart? Myschool

startsat9o’clock.Whataboutyou?

Myschoolstartsat9:10.Howdoyouknowwhattimeitis?

I lookthewallclock.

I usemywristwatch.

Lookattheclock.Ithastwo

hands.Oneislongandtheotheroneis

short.

Mygrandfatherlooksatthesunandtellsthetime.

Yes,thelonghandshows

theminuteandtheshorthandshowsthehour.

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Practice

1) ____o’clock 2) ____o’clock


What is thetimenow?


Hour and minute are standard units for calculating time.

Look at the clock and write the time.

Itis3o’clockbecausetheminutehand is at 12 and thehourhand

isat3.

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Hours and minutes

Lookattheclock.Theminutehandisat1andthehourhandisat3.

Yes,nowthetimeis5minutespast3or

three-five or3:05.

Lookattheclock.Theminutehandisat2

andthehourhandliesbetween3and4.Isit 10minutespast3?

Yes,wewriteitasthree-tenor

10minutespast3 or3:10

Canyouhelpmetoreadtheclock?

Oh,sure!lookhere.

Quarterofanhour = 14 hour=15minutes

Halfofanhour = 12 hour=30minutes

Three-quarterofanhour = 34 hour=45minutes

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Whentheminutehandshows3,thetimeis15minutespast3orquarterpast3orthree-fifteen.Itiswrittenas3:15.

Whentheminutehandshows6,thetimeis30minutespast3orhalfpast3orthree-thirty.Itiswrittenas3:30.

See the clock and write the time.

1:20

Whentheminutehandshows9,thetimeis45minutespastthreeor15minutestofourorthree-fortyfive.Itiswrittenas3:45.

Whentheminutehandmovesfromonenumbertothenextnumber,itmeans5minuteshavepassed.

Minutehandtakes60minutestocompleteonerotation.Thatisonehour. So, 1 hour = 60 minutes.

Practice

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Lab activity

Fill in the blanks to show your daily activities. Draw the hour and minute hands on the clock faces.

1) Igetupat6o’clock 2) Itakebathat_____

3) Mybreakfasttimeis______ 4) Igotoschoolat_____

5) Mylunchtimeis______ 6) Myschoolgetsoverat_____

7) Myeveningplaytimeis____ 8) Mystudytimeis____

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Intheabovepicturesboththeclockshows6o’clockonly.

Oneclockshows6o’clockinthemorningandtheotherclockshows

6o’clockintheevening.

6o’clockinthemorningis6antimeridian.

6o’clockintheeveningis6postmeridian.

Time with a.m and p.m

Whenitisexactly12noonor12midnightitisnotmentionedwitha.m.orp.m.

12o’clockatnightis12midnight.

12o’clockinthedayis12middayornoon.

Wecanwriteantimeridianasa.m. andpostmeridianasp.m.

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Practice

Day Chart

Write time using a.m. or p.m.

1)10:30inthenightis10:30p.m. 2)7:40inthenightis______

3)6:15intheeveningis______ 4)3:30inthemorningis____

5)8:30inthemorningis______ 6) 9:00inthemorningis____

7)1:30intheafternoonis____ 8)2:45intheafternoonis____

Midnight12o’clocktoNoon12o’clock

Midnight12o’clocktoNoon12o’clocktoMidnight12o’clock

a.m p.m

12hours 12hours

1day

1 day = 24 hours

24hours

Noon12o’clocktoMidnight12o’clock

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Duration of daily activities SundarisstudyinginclassIV.Hegetsupat6o’clockinthemorning.Hegoestoschoolat8.30a.m.andcomesbackhomeat5o’clockintheevening.Heplaysforsometimeandsitstostudy.Hegoestobedat90’clockinthenight.Can you find the duration of his daily activities?

Sundargetsupat6o’clock in themorningand thenhegoestoschoolat8:30a.m.Durationbetween6:00a.mto8:30a.mis2 hours 30 minutes.

Minutecanbewrittenasmin. and

hourcanbewrittenashr. .

1) Firstperiodstartsat9:30a.m,anddurationofoneperiodis

anhour.Thefirstperiodgetsoverat_____a.m.

2) Morningsessiongetsoverby12:40p.m.

Durationofthemorningsessionis_______hr______min.

3) Afternoonsessionstartsat2:00p.m.

Howlongisthelunchbreak?_______hr_______min.

4) Schoolgetsoverby4:10p.m.

Durationoftheafternoonsessionis_____hr____min.

5) Sundarstudiesfrom6:30p.mto8:30p.m.Durationofhis

studytimeis_______hrs.

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CALENDAR

januarySu Mo Tu We Th Fr Sa

1 2 3 4 5

6 7 8 9 10 11 12

13 14 15 16 17 18 19

20 21 22 23 24 25 26

27 28 29 30 31

AprilSu Mo Tu We Th Fr Sa

1 2 3 4 5 6

7 8 9 10 11 12 13

14 15 16 17 18 19 20

21 22 23 24 25 26 27

28 29 30

FebruarySu Mo Tu We Th Fr Sa

1 2

3 4 5 6 7 8 9

10 11 12 13 14 15 16

17 18 19 20 21 22 23

24 25 26 27 28

MarchSu Mo Tu We Th Fr Sa

1 2

3 4 5 6 7 8 9

10 11 12 13 14 15 16

17 18 19 20 21 22 23

24 25 26 27 28 29 30

31

2013

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julySu Mo Tu We Th Fr

Sa

1 2 3 4 5 6

7 8 9 10 11 12 13

14 15 16 17 18 19 20

21 22 23 24 25 26 27

28 29 30 31

AugustSu Mo Tu We Th Fr Sa

1 2 3

4 5 6 7 8 9 10

11 12 13 14 15 16 17

18 19 20 21 22 23 24

25 26 27 28 29 30 31

juneSu Mo Tu We Th Fr Sa

1

2 3 4 5 6 7 8

9 10 11 12 13 14 15

16 17 18 19 20 21 22

23 24 25 26 27 28 29

30

MaySu Mo Tu We Th Fr Sa

1 2 3 4

5 6 7 8 9 10 11

12 13 14 15 16 17 18

19 20 21 22 23 24 25

26 27 28 29 30 31

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Thecalendarshowsdaysoftheweeksandmonthsoftheyear.Wecanfinddateofaparticulardayofa

particularmonthfromit.

octoberSu Mo Tu We Th Fr Sa

1 2 3 4 5

6 7 8 9 10 11 12

13 14 15 16 17 18 19

20 21 22 23 24 25 26

27 28 29 30 31

NovemberSu Mo Tu We Th Fr Sa

1 2

3 4 5 6 7 8 9

10 11 12 13 14 15 16

17 18 19 20 21 22 23

24 25 26 27 28 29 30

SeptemberSu Mo Tu We Th Fr Sa

1 2 3 4 5 6 7

8 9 10 11 12 13 14

15 16 17 18 19 20 21

22 23 24 25 26 27 28

29 30

DecemberSu Mo Tu We Th Fr Sa

1 2 3 4 5 6 7

8 9 10 11 12 13 14

15 16 17 18 19 20 21

22 23 24 25 26 27 28

29 30 31

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Look at the calendar and write down the names of the months.

Months having 31 days Months having 30 days

February month has ____ days.

Look at the month of May and answer the following questions.

May 2013 Sun Mon Tue Wed Thu Fri Sat

1 2 3 45 6 7 8 9 10 11

12 13 14 15 16 17 1819 20 21 22 23 24 2526 27 28 29 30 31

1) How many Mondays are there in this month? ____________

2) How many Sundays are there in this month? ____________

3) Which celebration falls on 1st May? ____________

4) Mention the dates that fall on Friday. ____________

5) Writethefirstdayofthismonth. ____________

6) Name the last day of this month. ____________

Practice

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Months, weeks and days in the year 2013Fill in the boxes.

NameofthemonthNumberofdaysinthemonth

Numberofweeksanddays

January 31 4weeks3days

February 28 4weeks0days

March 31 4weeks3days

April 30 4weeks2days

May 31 weeksdays

June 30 weeksdays

July 31 weeksdays

August 31 weeksdays

September 30 weeksdays

October 31 weeksdays

November 30 weeksdays

December 31 weeksdays

Total 365 48weeks29days

1 Week = 7 days

48weeks+29days = 48weeks+28days+1day = 48weeks+4weeks+1day = 52weeksand1dayApproximately 1month =4weeks 1year=52weeks Anordinaryyear =365days Aleapyear =366days InaleapyearFebruaryhas29days.

Normally a leap year comes once in four years.

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Number of days between any two given dates

Tellmeyourdateofbirthandtoday’sdate.

Mydateofbirthis12thAugustandtodayis15thJuly.

Howmanydaysaretherefrom15thJulyto31stJuly?

InJuly17daysandinAugust12days.So 29days togo.

Howmanydaysaretheretomybirthday?

17days.(15,16,17.........31)

Howmanydaysaretherefrom1stAugustto12th August?

12days.

Whatisthetotalnumberofdays.

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Festival Month Date DayDeepawaliChristmasMiladinabiChildren’sdayTeacher’sday

Holidays From To Totaldays

Summerholidays

Count the number of days from 13th April to 3rd june. April________ 18days

May________ 31days

June________ +3days

Total52days

Calculate the number of days between the given dates.1) From4th Mayto21stJune.

2) From9thOctoberto11thDecember.

3) From3rd Januaryto15thFebruary.

4) From15th Augustto2ndOctober.

Calculate the number of holidays.

Look at the current year calendar and fill up the table.

Practice

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Lab activity

clock-1 8:00a.m.

clock-2 2:00p.m.

Timelapse 6hours

� Dividethechildrenintothreegroups.� Firstgroupshowsthea.m.timeintheclock-1� Secondgroupshowsthep.m.timeintheclock-2� Thirdgrouptellsthetimelapse.

Fill in the blanks :

Days of an ordinary year Months Days of a leap year

31days

30days

January

February

March

April

May

June

July

August

September

October

November

December

30days

31days

Clock-1 Clock-2 a.m. p.m.

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Answer the following questions.

1) Write the time of the following.

2) Write time with a.m or p.m.

i) 4o’clockinthemorning ______

ii) 11:30inthenight ______

iii) 11:30beforenoon ______

3) Whichtwosuccessivemonthshave31days?

4) Namethemonthwhichhaslessthan30days.

5) Howmanydaysarethereinaleapyear?

6) Whichisthelastmonthoftheyear?

7) CalculatethenumberofdaysbetweenChildren’sdayand

Christmas.

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Fill in the blanks.

1) 1hour=_____minutes

2) _____hours=1day

3) 1year=_____days

4) 1year=_____weeks

5) 12months=_____year

6) Quarterofanhour=______minutes

7) Three-quarterofanhour=______minutes

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Sl.No Date Lesson

No.TopicoftheLesson Activities Remarks

‘Ican,Idid’Student’sActivityRecord

Subject:

standard four

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