Page 51 - ICSE Math 2

Addition of Two 2-Digit Numbers

To add two 2-digit numbers, fi rst add the ones and then the tens.

Let’s add 42 and 36
T O T O
4 2 4 2

+ 3 6 + 3 6

8 7 8

Step 1: Add the ones. 2 + 6 = 8 Step 2: Add the tens. 4 + 3 = 7
So, 42 + 36 = 78.

1. Find the sum of the given numbers.

T O T O T O
(a) (b) (c)
2 3 5 4 8 0

+ 5 4 + 2 1 + 1 6

(d) 74 + 12 (e) 49 + 20 (f) 62 + 17
T O T O T O

+ + +

2. Find the sums and match them with their number names.

(a) 53 + 21 (i) Forty-six

(b) 62 + 13 (ii) Twenty-nine

(c) 45 + 20 (iii) Seventy-four

(d) 30 + 16 (iv) Seventy-five

(e) 7 + 22 (v) Thirty-nine

(f) 24 + 15 (vi) Sixty-five

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