Page 136 - New Medley 4 Semester 1

The following example will make things clear.

Example 12: Check the answers of the following:

(a) 8 8 6 4 7 (b) 1 5 8 5 7 8

– 1 0 3 9 0 – 1 2 6 2 8 4

7 8 2 5 7 1 4 2 7 4

Solution: We add last two numbers in each case.

If we get their sum as the first number, our answer is

correct, otherwise wrong.

(a) 1 0 3 9 0 (b) 1 2 6 2 8 4

+ 7 8 2 5 7 + 1 4 2 7 4

8 8 6 4 7 1 4 0 5 5 8

Same as the first Different from the first

number. number.

Answer is correct. Answer is not correct.

EXERCISE 2.5

A. Find the difference.

1. TTh Th H T O 2. TTh Th H T O 3. L TTh Th H T O

5 5 7 5 7 9 8 8 7 4 5 8 6 5 2 5
– 2 2 1 7 4 – 7 4 6 1 2 – 2 7 5 0 0 5

4. TTh Th H T O 5. TTh Th H T O 6. L TTh Th H T O

8 0 2 8 7 9 7 7 0 9 8 7 8 0 2 1
– 6 1 0 2 2 – 4 2 2 1 9 – 5 4 9 2 6 4

B. Subtract:

1. 98467 – 76742 2. 85987 – 62824

3. 895278 – 567289 4. 72474 – 56547

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