Page 30 - Math Skill - 4

28 Maths

Checking Subtraction Using Addition
We can check subtraction with the help of addition.

To check subtraction, the difference is added to the subtrahend. If the sum is equal to the
minuend, then the subtraction is correct, otherwise it is incorrect.

Let us subtract 23431 from 64542 and check our answer.

Checking:
6 4 5 4 2 Minuend
4 1 1 1 1 Difference
– 2 3 4 3 1 Subtrahend
+ 2 3 4 3 1 Subtrahend
4 1 1 1 1 Difference
6 4 5 4 2 Minuend

Thus, the subtraction is correct.

Exercise 2.4

1. Subtract the following.

(a) TTh Th H T O (b) TTh Th H T O (c) L TTh Th H T O
8 7 2 4 6 6 3 4 5 2 3 7 4 2 3 6

– 4 2 1 2 – 3 1 3 0 1 – 1 5 3 2 2 1

(d) TTh Th H T O (e) TTh Th H T O (f) L TTh Th H T O
7 4 6 2 5 4 2 6 0 5 9 0 8 9 3 0

– 2 5 0 3 6 – 2 3 0 4 7 – 4 7 8 9 3 2

2. Write in columns and find the difference.
(a) 2566 from 36898 (b) 1786 from 51389
(c) 51242 from 76859 (d) 45789 from 89301

3. Replace the ‘*’ with the correct digit.

(a) TTh Th H T O (b) TTh Th H T O (c) TTh Th H T O
8 6 1 5 6 3 8 9 * 6 * 9 5 4 7
– 2 * 0 * 6 – * * 4 6 5 – 6 7 4 * 6

6 2 1 2 * 2 2 5 3 * 2 * 1 1 *