Page 34 - TouchPad Mathematics_Ver 1.0_C2

E:\Working\Orange_Education\TouchPad_Maths_2\Open_Files\Maths_2_Chapter-02
\ 14-Nov-2025 Bharat Arora Proof-7 Reader’s Sign _______________________ Date __________

ADDITION By FOrwArD COuNTINg

We can use a number strip to add numbers by forward counting. Suppose

we need to find 12 + 7.

We start from 12 and count 7 steps forward.

1 2 3 4 5 6 7

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

So, 12 + 7 = 19.

Exercise 2A

1. Fill in the boxes.

a. 32 + = 32 b. 48 + 0 = c. 64 + = 65

d. 75 + = 76 e. 0 + 84 = f. + 1 = 81

2. Add by forward counting:

30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

a. 32 + 8 = b. 41 + 9 = c. 37 + 6 =

d. 35 + 5 = e. 33 + 11 = f. 36 + 13 =

ADDITION ON THE NuMBEr grID

This is a number grid. It helps us to add 1 2 3 4 5 6 7 8 9 10
two numbers in an interesting way. 11 12 13 14 15 16 17 18 19 20

Let us add 26 + 4. 21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40
Find 26 on the number grid and move
4 boxes forward (+ 4). 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
We reach 30. 81 82 83 84 85 86 87 88 89 90

Hence, 26 + 4 = 30. 91 92 93 94 95 96 97 98 99 100

32 Mathematics 2