Tamilnadu State Board 2nd standard textbook

7/27/2019 Tamilnadu State Board 2nd standard textbook

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MATHEMATI C S

Shall we admire the beautiful designs in the wings of theuttery, petals of sunower and plumage of peacock?

Some more designs are given bel

Patterns arearrangements of

similar designsin a particular

order.

1. PATTERNS IN SHAPES


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M A T H E M A T I C S

Match the group with its kind.


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MATHEMATI C S

Match the animal with its shadow by drawing a line.


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Find the odd one and colour it .


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MATHEMATI C S

Draw the given patterns and enjoy doing it .

3 5 8 3 5


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Repeat the patterns as g iven.


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MATHEMATI C S

Continue the pattern by drawing the next o ne.


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Draw the next pattern.


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MATHEMATI C S

Complete the other half of the pattern.

F ower Po

Bucket Ba Po


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2. NUMBERS

Revision

Wr e t e o owng n numera s.

Seven Thirteen

N ne F teen

E even N neteen

Wr te t e o owng n wor s.

8 Eight 14

10 16

12 18

Circle the greatest number in the following.

6 13 10 7 6 8

18 7 132 9 6

16 19 14 11 9 12

Circle the smallest number in the following.

4 3 2 13 11 9

7 6 8 15 13 17

10 12 14 16 18 19


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MATHEMATI C S

What comes after ? What comes before ?

18

What comes between ?

8 105 76

13 15 2 4

18 166 8

What comes before, after and between ?

5 7 8


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MATHEMATI C S

5

Match the following.

umera s um er names

37 Forty-two

66 Eighty-one

42 Fifty

50 Thirty-seven

81 Sixty-six

Write the numerals for the following.

Fifteen Sixty

Nineteen Seventy-seven

Twenty-ve Eighty-nine

Forty-eight Ninety-ve

Fifty-three Hundred

Write the number names for the following.

16 ________________ 69 ________________

27 ________________ 76 ________________

35 ________________ 80 ________________

59 ________________ 93 ________________

61 ________________ 99 ________________


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Grouping into tens and ones.

13 ones give 1 ten 3 ones

24 ones g ve 1 ten 1 ten 4 ones2 tens an 4 ones

40 ones g ve 1 ten 1 ten 1 ten 1 ten 0 ones

4 tens an 0 ones

10 ones are equal to 1 ten


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MATHEMATI C S

7

Write the number in the box, using the abacus.

23

Tens Ones

Tens Ones

Tens Ones

Tens Ones

Tens Ones

Tens Ones

30


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Read the numbers and draw the beads in the abacus.

Tens Ones

Tens Ones

Tens Ones

Tens Ones

Tens Ones

Tens Ones

32

29

66

78

80

95


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MATHEMATI C S

9

Write the place value of the digits in the fol lowing numbers

Write in the short form.

3 tens an 2 ones

4 tens an 5 ones

7 tens and 0 ones

8 tens an 8 ones

9 tens an 7 ones

32

8 9

9 5

7 8 0

4 6

6 4

2 5

5 ones

2 tens

5 0

0 ones

5 tens


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1

23

4

0 89

7

65

Write in the expanded form.

28 = 2 tens and 8 ones

41 = tens an ones

72 = tens an ones

83 = tens an ones

90 = tens an ones

Write the place value of the underlined numbers.

9 9 ones 2

29 62 tens 4

38 7

47 8 5

53 9 9

Prepare the number cards from 0 to 9

Take any two cards and make a 2 - digit

number. Say the place value of the digits.

Repeat the activity using other cards.


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MATHEMATI C S

3. COMPARISON OF NUMBERS

We can compare the numbers as

> greater t a

< Less t an = equa to

Compare the numbers 63 and 45.

63 is greater than 45

63 > 45


39 is less than 54

39 < 54

tens ones

36

tens ones

5 4

Comparing the tens place

The greater number inthe tens place is the

greater of them.

Let us learn to compare the-digit numbers using place value.

tens ones

3 9

tens ones

5 4

3 < 5

6 > 4


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MATHEMATI C S M

A T H E M A T I C S

Now compare the numbers 78 and 72.

78 is greater than 72

78 > 72


42 is less than 45

42 < 45


86 is equal to 86.

86 = 86.

Observe the following.

25 93 9=38 >

26 26 86 7 >=

66 33 38 2

If the numbers in tens p lace are same,then compare the numbers in ones place.

tens ones

2 4

4 = 4

ens ones

4 5

2 < 5

If the numbers intens and ones places

are the same thenthey are equal.


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MATHEMATI C S

Compare the numbers and use > or < or =

73 85 93 39

29 29 25 52

36 25 77 77

40 40 80 72

71 79 36 63

Play and Learn

Prepare the number cards from 1 to 100 as

........................ 100 2 31

and the symbol cards

he class is divided into two groups.Group 1 picks a pair of number cards.

Group 2 places the symbol card between the numbers.

Repeat the activity using other cards.


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MATHEMATI C S

Descending Order

Let us arrange t e num ers 46, 32 an 58 in descending order.

We get 58, 46, 32.

Arrange the following numbers in ascending order.

56, 37, 25 = , ,

93, 84, 81 = , ,

27, 43, 38 = , ,

75, 72, 74 = , ,

54, 63, 45 = , ,

Arrange the following numbers in descending order.

27, 35, 53 = , ,

72,86, 85 = , ,

26, 62, 22 = , ,

38, 86, 31 = , ,

46, 94, 64 = , ,

Descending order is arranging thenumbers from the greatest to thesmallest.


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MATHEMATI C S M

A T H E M A T I C S

Select any three numbers from the picture. Arrange them into ascending and descending order.Do as many sums as possible.

Prepare the number cards from 1 to 100.

........................ 100 2 31

Divide the class into two groups.

Group 1 should take any three cards.

Group 2 should arrange them in the ascending order.

Repeat the activity by changing the group.

Repeat the activity in descending order.

19

7

88

4598

61

53

6

9 7

7 0

Numbers : ____, ____, ____,

Ascending order : ____, ____, ____,

Descending order : ____, ____, ____,


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MATHEMATI C S

Odd and Even Numbers

Circle the owers in pairs.

1

2

3

4

5

6

7

8

9

10

What do you observe?From the above table, we see the numbers 2, 4, 6, 8, and 10 are

exactly paired.

T e ot er num ers 1, 3, 5, 7 an 9 are not exactly paired.


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MATHEMATI C S

Skip counting numbers.

Tinku, an active rabbit, jumps over a carrot and reaches the nextone. Where will Tinku go next?

Tick ( ) the numbers in the carrot that the rabbit skipped over.

Look at the pond where Mr. Froggi jumps and gets on a stone.here will he go next?

Circle the numbers that he skipped over.


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A T H E M A T I C S

Boogee, a kangaroo hops and stops at a plant in a particular order to have her meal. Where will she go next?

Tick ( ) the numbers that she skipped over.

Let us learn skip counting on the Number Line

Skip count in 2s and circle the numbers.



0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16


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MATHEMATI C S

Count in 2s and circle the number.

s ng t e a ove c art,

Count n 3s an st t. 3, 6, 9, Count n 5s an st t. 5, 10, 15,

Count n 2s an st t. 11, 13, 15,

Read and write what comes next ?

8, 10, 12,

, , ,

, , ,

47, 49, 51,

, , ,

1 2 3 4 5 6 7 8 9 10

11 12 13 14 15 16 17 18 19 2021 22 23 24 25 26 27 28 29 30

31 32 33 34 35 36 37 38 39 40

41 42 43 44 45 46 47 48 49 50

51 52 53 54 55 56 57 58 59 60

61 62 63 64 65 66 67 68 69 70

71 72 73 74 75 76 77 78 79 80

81 82 83 84 85 86 87 88 89 90

91 92 93 94 95 96 97 98 99 100


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A T H E M A T I C S

Fill in the blanks

4, 7, 10, , ,

24, 27, 30, , ,

55, 58, 61, , ,

66, 69, 72, , ,

82, 85, 88, , ,

What comes next ?

5, 10, 15, , ,

30, 35, 40 , ,

55, 60, 65 , ,

75, 80, 85, , ,

20, 25, 30, , ,

Counting backwards

Counting backwards in 2s 14, 12, 10, 8, 6, 4, 2, 0.

Counting backwards in 3s 15, 12, 9, 6, 3, 0.

Counting backwards in 5s 15, 10, 5, 0.

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15


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MATHEMATI C S

Read and write by counting backwards.

14, 12, 10, , ,

60, 58, 56, , ,

82, 80, 78, , ,

18, 15, 12, , ,

45, 42, 39, , ,

90, 87, 84, , ,

35, 30, 25, , , .

55, 50, 45, , ,

Do it yourself

Startng rom 50 ,count backwards in 2s, 3s, an 5s.


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T H E M A T I C S

4. ADDITIONLet us recall.

3 2 5

Addition means put together or added together.

It is represented by the symbol + .


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MATHEMATI C S

Count and Add.


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T H E M A T I C S

Fill the addition table

2

9

2 7

6

4

10

13

7 8

14

+


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MATHEMATI C S

Shall we add more than two 2-digit numbers ?

Add 45 + 34 + 13

Add the numbers which are in the ones place

3 ones 4 ones 5 ones 12 ones

change 12 ones 1 ten 2 ones

Wr te 2 in the ones place andcarry 1 to the tens place.

Now, add the tens

1 ten 3 tens 4 tens 1 ten 9ens.

Wr te 9 tens n t e te s place

45 + 34 + 13 = 92.

T O

3

1

Add and write the answer

T O

2

T O1 8

T O6 7

T O

4

T O

3 7

T O2 74

T O

2 7

T O

2


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T H E M A T I C S

Addition with zero

5 + 0 5

Any number added to zero or zero addedto any number gives the same number

= =2 + 3 = 5 = 3 + 2

Properties of addition

Even if we change the position of the numbers,the value remains the same

= =4 + 5 = 9 = 5 +

Fill in the boxes

Add

T O

2 7

T O

2

1 + 4 = +

+ = +

+ = +

3 + 0

0 + 7

5 + 0


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MATHEMATI C S

Word Problems ( Addition )

Rav as 5 re a s an 3 green a s.

ow many balls does he have in all?

Re a s = 5

Green a s = 3

Total number of balls = 8

Ravi has 8 balls.

A ru t se er as 40 oranges an 25 apples in his shop.

ow many fruits does he have in all ?

A fruit seller has

Oranges

Apples =

Total number of fruits

Fruit Seller has fruits

ere are 19 boys and 23 girls in a class.

ow many children are there in the Class?Number of boys =

Num er o g r s

Total number of children =

T ere are children.


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40father gave he ` 20

ore. How muchdoes she

have now?

32 children were playingn the park . 10 more

children joined them.ow many childrenwere playing?

In a Cricketmatch, Arulscored 19runs anJohn scored 24 runs.

ow many runs didboth of them score

In a bus, there were 23 men,32 women and 12 children.

ow many passengers werethere in the bus ?

In a library there are50 Tamil books and40 English books.W at s t e totanumber of books inthe library ?

In a pond, there are18 lily owers and 15lotus owers. Howmany owers arethere in the pond?


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MATHEMATI C S

In a farm, there are 20goats an 30 cows.

ow many cattle arehere in the farm?

Mind Maths

In a basket, thereare 30 mangoesan 10 ananas.

ow many fruits arethere altogether?

On Saturday, I read30 pages of a storybook. I read another 20 pages on Sunday.How many pages didI read in all?

In two queues, therewere 40 men an 50women. How many

eople were theren the queues?

60 coconut saplingsan 10 mango saplingswere planted in a farm.Find the total number of saplings in the farm?


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Let us form addition stori es

Tell me a story for

this addition fact,

8 + 4

Umar had 8 rupees in his piggybank. He puts 4 rupees morein it. How much does he have

now?

To develop the addition skill in day-to-day life, the aboveoral activity is suggested

Teacher may give more addition facts to the children andask them to narrate the stories of their own.

Rita has 8 red bangles and 4 green bangles. Find the totalnumber of bangles she has?

Teachers Note


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MATHEMATI C S

Observe the height of the following pic tures.

Tick the taller object.

5. MEASURES OF LENGTH


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Observe the length of the following pictures.

Tick which is longer


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MATHEMATI C S

Observe the picture.

Put ( ) for the correct answer.

depth

Which is nearer to the house?School / Temple.

Which is nearer to the park?Temple / School

Which is far from the temple?Park / House


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Measure the things in the classroom by using your handspan, nger span and cubit.

The length of the table is ______

hand spans and ____ nger spans.

The length of the pencil is ______ nger spans.

The length of the blackboard is _____ cubits.

We measure the length ordistance in many ways.

Hand span Finger span Cubit


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MATHEMATI C S

he length of the cricket pitch is 22 paces.

he length of your classroom is ____ feet.

Foot Pace


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Use the following to measure the given objects.

he size of the hand andfoot differs from person

o person.

In the above activities,compare your answers

with your friends.

his may not be the same.You see some differences inmeasures. Why?

So there is a need for astandard unit of measurement.When we use standard units,the measurements would be thesame.


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MATHEMATI C S

Metre is the standard unit of length.

We measure larger lengths in metres .

We measure smaller lengths in centimetres and millimetres .

The scale has centimetres on one side.

Find out which distance is shorter.

Your house to the school. or

Your friends house to the school.

e uy c ot y measur ng tsengt n metres.

A tailor takes measures of lengthto stitch a shirt in centimetres

Do you know?

The longest bone in the human bodys t e t g one.


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Tamilnadu State Board 2nd standard textbook

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Transcript of Tamilnadu State Board 2nd standard textbook