2nd Maths: Term 1 Unit 2 - Numbers
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.
2. Write the number statement to get the answer 6.
3. Write the subtraction fact to get the answer 1.
4. Subtract the following.
Teacher’s Note: Make the children to understand the difference between the numbers and help to find answer.
Travel Through
Birthday celebration
Satish distributed 20 peanut cakes (kadalai mittai) to his friends on his birthday.
Complete the subtraction fact.
20 – 4 = 16
16 – 3 = 13
13 – 5 = 8
8 – 2 = 6
6 – 3 = 3
3 – 3 = 0
Keywords: Take away, Difference, Remaining, Left, Balance
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?
2. There are 56 tender coconuts in a shop 30 are sold out. How many tender coconuts are remaining in the shop?
Practice
1. Leela plucked 28 lemons and used 5 lemons for preparing juice. How many lemons were left?
28 − 5 = 23
Ans : 23
2. Bala made 26 paper boats and Kala made 6 paper boats. How many paper boats did Bala make more than Kala?
26 − 6 = 20
Ans : 20
3. Siva had 36 peanuts, He ate 14 peanuts in the play time. How many peanuts remain in his pocket?
36 − 14 = 22
Ans : 22
4. Kaviya’s mother prepared 57 sesame balls. She ate 13 sesame balls with her friends. How many sesame balls are left with her?
57 − 13 = 44
Ans : 44
Learn
Various ways of subtraction
1. Subtraction using fingers : 38 – 5
2. Subtraction using number line 38 – 5
38 − 25 =13
Subtraction using beads 38 – 25
38 – 25 = 13
Subtract using abacus 98 – 25
98 – 25 = 73
Practice
i. Subtract by striking the beads
48 – 5
Ans : 43
78 – 35
Ans : 43
Subtract using abacus
36 – 3 = 33
Ans : 33
69 – 47 = 22
Ans : 22
ii. Find the value.
Know More
Both are same
For any given addition fact, we can form 2 subtraction facts.
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.
Think like a Mathematician
Observe the patterns and complete the subtraction facts.
Ans : 55, 31, 21, 10, 5
Pleasure Time
Complete the outer circle by writing the subtraction fact. One is done for you.
Try This
a. Find the answer for the subtraction facts given below.
Subtraction fact = Answer
37 – 30 = __
46 – 41 = __
68 – 54 = __
70 – 70 = __
57 – 42 = __
21 – 0 = __
39 – 20 = __
Show Answers
37 – 30 = 7
46 – 41 = 5
68 – 54 = 14
70 – 70 = 0
57 – 42 = 15
21 – 0 = 21
39 – 20 = 19
b. 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.
Show Answers
20 – 0 = 20
30 – 21 = 9
39 – 37 = 2
46 – 39 = 7
42 – 41 = 1
57 – 54 = 3
70 – 68 = 2
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?
Ans: 29 – 12 = 17
2. There are 19 children in the park. 2 of them went out of the park. How many children are inside the park?
Ans: 19 – 2 = 17
3. There were 33 birds in the garden. 11 flew away. How many birds were left in the garden?
Ans: 33 – 11 = 22
4. There are 64 goats in a farm. 11 of them were taken to another farm. How many goats are left?
Ans: 64 – 11 = 53
5. There are 38 paint brushes in the box. 10 brushes are used. How many brushes are unused?
Ans: 38 – 10 = 28