Page 77 - ICSE Math 2

Method 3

Subtract an easy number close to the actual number and then correct the answer.

Look at the given example.

73 – 38

Subtract 40 (38 + 2) from 73, as it is close to 38 and easy to subtract.

73 – 40 = 33

Now, correct the answer by adding 2 to 33, as we subtracted 2 more than 38.

So, 73 – 38 = 35.

9. Subtract the given numbers mentally.

(a) 86 – 35 = (b) 87 – 38 = (c) 81 – 77 =

(d) 83 – 48 = (e) 56 – 45 = (f) 61 – 28 =

Test Yourself

1. Write the subtrac on facts for the following.

(a) 2 + 8 = 10

(b) 5 + 4 = 9

2. Write the addi on facts for the following.

(a) 12 – 7 = 5

(b) 9 – 3 = 6

3. Find the diff erence.

(a) 62 – 57 (b) 95 – 76 (c) 80 – 51

T O T O T O

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