2.

In an inter school competition, a school had won 30 gold medals and

21 silver medals. Find the total number of medals won by the school.

Tens Ones T O

3 0

+ 2 1

3. Reena bought 30 pens from the shop. Next day, she purchased 50
more pens. Count and write the total number of pens she had.
Tens Ones T O

3 0

+ 5 0

4. Mani has 54 pencils, Benny has 21 pencils and Malini has 23 pencils.
How many pencils do they have in total?
Tens Ones T O

5 4

2 1

+ 2 3

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 Learn Various ways of addition
1) Add using fingers : 24 + 3
26 2) Add using number line : 14 + 5
25 27
24

10 11 12 13 14 15 16 17 18 19 20

24 + 3 = 27 14 + 5 = 19
3) Add using beads : 32 + 24 + 13 4) Add using abacus : 26 + 61

+ + =

T O T O T O
32 + 24 + 13 = 69 2 6 + 6 1 = 8 7

Practice Add the following

T O T O T O
2 5 4 2 6 0
+ 3 + 0 + 1

T O T O T O
4 5 2 3 5 0
+ 2 3 + 4 0 + 3 0

T O T O T O
3 6 4 8 7 6
2 2 1 0 2
+ 4 1 + 3 0 + 2 1

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 Add the following

i) 34 + 35 = ii) 13 + 2 + 1 = iii) 14 + 10 + 2 =

iv) 34 + 30 + 3 = v) 30 + 26 + 40 = iv) 45 + 23 + 21 =

Try This
Colour the tens and ones for given numbers 43 and 25. Find
the sum: 43+25
Add the ones of the given number by colouring single beads.
Add the tens of the given number by colouring strips of ten beads.

Tens Ones

Total

Pleasure Time
Complete the circles on the right by adding each of the numbers on
the left with 10 and with 14. One is done for you.

20 + = 30 32 + = 46

25 + = 40 + =
10 14
36 + = 53 + =

+ = + =
48 65

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 Know more
Both are same

23 + 5 = 28 5 + 23 = 28

13 + 0 = 13 0 + 13 = 13

23 + 35 = 58 35 + 23 = 58

Activity

 Divide the class into 2 groups and give 100 sticks (bundles of 10
sticks and few single sticks) to each group.
 Teacher shall give two numbers to add. For example, 42 and 56
 The first group shall take 40 + 2 sticks and the second group
shall take 50 + 6 sticks.
 Both the groups shall combine the sticks. Count the bundles of
sticks and single sticks separately and find the total.
 Teacher can instruct the groups to add the single sticks first,
write the number below the ones place and then add the bundle
of sticks and write the number below the tens place.

Mental Maths

1. 30 children are lined up to jump using a skipping rope. If 20 more

children join them, how many children are there in total?
2. In a park, Suji counted 12 children and 15 adults.
How many people did she count in total? 30
20+
3. A fisherman caught 22 fishes in the morning and
12 fishes in the afternoon. How many fishes did
he catch totally?
4. There are 15 boys and 24 girls in a class room.
How many students are there altogether?
5. In a bird sanctuary, there are 33 parrots and
15 peacocks. How many birds are there in total?

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 2.7 Subtraction
Recall
Observe the picture and write the subtraction fact by striking
out the objects.
1. Write the subtraction fact inside the box to get the difference 2.
One is done for you.

6-4

2. Write the number statement to get the answer 6.

3. Write the subtraction fact to get the answer 1.

4. Subtract the following.

13 16 18 10
–7 –9 –4 –3

Teacher‛s Note:
Make the children to understand the difference between the numbers and help to find answer.

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 Travel Through Birthday celebration
Keywords
Satish distributed 20 peanut ay
Take aw
4 = 16 ce
20 Differen
cakes (kadalai mittai) to his –
g
friends on his birthday.
16 – 3 = 13 Remainin
Left
13 – 5 = 8 Balance

– 2 =

– 3 =

– ? = 0
Complete the subtraction fact.

Teacher‛s Note:
Teacher can create more subtraction facts from the above situation by varying the number
of peanut cakes taken by the children.

Learn
1. Kamali had 25 cucumbers She distributed 3 of them to her
friends. How many cucumbers are left with kamali?
Tens Ones T O

2 5

− 3

2 2
2. There are 56 tender coconuts in a shop 30 are sold out. How
many tender coconuts are remaining in the shop?
Tens Ones T O

5 6

− 3 0

2 6
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 Practice
1. Leela plucked 28 lemons and used 5 lemons for preparing
juice. How many lemons were left?
Tens Ones T O

2 8

− 5

2. Bala made 26 paper boats and Kala made 6 paper boats. How many
paper boats did Bala make more than Kala?
Tens Ones T O

2 6

− 6

3. Siva had 36 peanuts, He ate 14 peanuts in the play time. How many
peanuts remain in his pocket?
Tens Ones T O

3 6

−1 4

4. Kaviya‛s mother prepared 57 sesame balls. She ate 13 sesame

balls with her friends. How many sesame balls are left with her?
Tens Ones T O

5 7

−1 3

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 Learn Various ways of subtraction

Subtraction using fingers : Subtraction using number line

38 − 5 38 − 5
36 35 34
33
37
29 30 31 32 33 34 35 36 37 38 39 40

38 − 5 =33

Subtraction using beads 38 − 25 Subtract using abacus 98 - 25

38 − 25 =13 T O

98 – 25 = 73

Practice
Subtract by striking the beads Subtract using abacus
48 − 5 36 - 3

T O
36 – 3 =

78 − 35 69 − 47

T O
69 – 47 =

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 Find the value.

T O T O T O
8 9 5 6 8 4
− 7 − 2 2 − 7 3

T O T O T O
4 8 7 2 6 0
− 7 − 3 2 −2 0

Know More
For any given addition fact, we can form 2 subtraction facts.

20 + 7 = 27 32 + 17 = 49

27 − 7 = 20 27 − 20 = 7 49 − 32 = 17 49 − 17 = 32

Activity

 Teacher shall divide the class into groups of two members and
place 9 bundles of 10 sticks in a box and 9 single sticks in a box.
 Teacher shall write a subtraction fact on the board and call one
group to find the answers.
 One member should pick up the bundle of tens and other member
should pick up the loose sticks according to the number .
 They shall subtract the numbers by putting the bundles and
loose sticks back in box and then show the bundles and loose
sticks left with them.
 Teacher can continue the activity with other children.

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 Think like a Mathematician
Observe the patterns and complete the subtraction facts.

66
= − = − = −

32 11 24 10 11 5
− = − = − =

98

Pleasure Time
Complete the outer circle by writing the subtraction fact.
One is done for you.

9 10 1
8
10-

10 2
2=8

7
3
6
5 4 90
-
20

10
=7

0
0

20
90
80 90 30
40
70
60 50

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 Try This
Find the answer for the subtraction facts given below.
Subtraction fact Answers
37 – 30
46 – 41
68 – 54
70 – 70
57 – 42
21 – 0
39 – 20
Create more subtraction facts using the following numbers 0, 20,
21, 30, 37, 39, 41, 42, 46, 54, 57, 68, 70 and find the solution.
Subtraction fact Answers

Mental Maths

1. Ilakiya made a bouquet with 29 flowers. As she was arranging the

bouquet, 12 flowers fell off. How many flowers were left in the
bouquet?
2. There are 19 children in the park. 2 of them went out of the
park. How many children are inside the park?
3. There were 33 birds in the garden. 11 flew away. How many birds
were left in the garden?
4. There are 64 goats in a farm. 11 of them were taken to another
farm. How many goats are left?
5. There are 38 paint brushes in the box. 10 brushes are used. How
many brushes are unused?

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 UNIT
Patterns
3
3.1 Patterns in sound
s
Travel Through Keyword
All through the way...
Patterns
Sound

The ox cart makes sound kada muda kada…

kada muda kada… kada muda kada…
The ox cart makes sound kada muda kada…
All through the way.

The horse cart makes sound tuck tuck tick…

tuck tuck tick… tuck tuck tick...
The horse cart makes sound tuck tuck tick…
All through the way.

The cycle bell makes sound tring clink tring…

Tring clink tring... tring clink tring...
The cycle bell makes sound tring clink tring…
All through the way.

The motorcycle makes sound dub dub dub...

Dub dub dub... dub dub dub...
The motorcycle makes sound dub dub dub...
All through the way.

The train makes sound chik buk chik…

chik buk chik… chik buk chik…
The train makes sound chik buk chik…
All through the way.

Teacher‛s Note:
The teacher, along with the children has to sing the rhyme with actions.

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 Learn
Observe and repeat the patterns in sound.

10 Times

Clap Clap Clap...

10 Times

Clap Clap Tap Tap...

6 Times

Clap Clap Tap Tap Tap Snap

We can extend the patterns in sound in many ways like the above.

Practice
Create patterns in sound by clapping, tapping and snapping.

Once Twice Twice

Know More
Music is the sound pattern formed by various musical
instruments.

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 Activity Making tunes with vessels

Procedure:
 Divide the students into two groups.
 The first group shall have plates and spoons.
 The second group shall have lunch boxes and spoons.
 If the teacher says 1 and 3, the first group should tap
the plates with the spoons one time and the second
group should tap the lunch boxes with the spoons 3
times.
 Continue to do it in the similar way till the teacher
says the next pair of number.

Try This My own tune

Create your own patterns in sound using materials available in your

locality such as toys, sticks, etc.,

Pleasure Time

Let us create our own musical instrument by following the given steps.

Step 1 Step 2
Take a tin, a balloon, a Cut the balloon as
rubber band 2 sticks, shown in the figure.
and a pair of scissors.

Step 3 Step 4
Fix the balloon on the Create a sound pattern
tin. of your own and share
it with your friends.

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 3.2 Patterns in body movements and sound

Travel Through Kummiyattam Keywords

vemen ts
Body mo

Observe the picture and discuss.

1. What do you see in above picture?
2. On which occasion this type of dance is performed?
3. What type of sound is the base of kummiyattam?
Teacher‛s Note:
Teacher can play kummi or kollatam song to facilitate the children to make patterns by
combining body movements and sound.

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 Learn Land and Sky game

Play the land and sky game by following instructions given below.

If the teacher says Land, the If the teacher says Sky,the

students should clap their students should clap their
hands downwards as given in hands upwards as given in the
the picture. picture.

Let us play and enjoy the patterns in body movements and sound.

Practice Dance Dance Dance

Observe the variation in pattern. Enjoy and perform the body

movements using instruments shown.

Teacher‛s Note:

Teacher can facilitate the children to perform different actions following a pattern.

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