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Exercise 7F

Subtract the tens vertically.

1. T O 2. T O 3. T O 4. T O 5. T O

7 0 5 0 4 0 7 0 6 0

– 6 0 – 3 0 – 1 0 – 3 0 – 3 0

6. T O 7. T O 8. T O 9. T O 10. T O

8 0 8 0 4 0 3 0 6 0

– 4 0 – 2 0 – 3 0 – 1 0 – 4 0

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using Expanded Form

Example 1. Subtract 42 from 79. T O
Solution. Write the given numbers in 7 9 7 tens and 9 ones

expanded form and then subtract. – 4 2 - 4 tens and 2 ones
Thus, 79 - 42 = 37.
3 7 3 tens and 7 ones
using the Short Method

Example 2. Subtract 43 from 65.

Solution.
Step 1. Subtract the ones. Step 2. Subtract the tens.

T O T O
6 5 6 5

– 4 3 – 4 3

2 2 2

So, 65 - 43 = 22.

115
Addition and Subtraction up to 100