Page 133 - New Medley 1 Semester 1

Subtraction By Backward Counting

Suppose we have to subtract 6 from 15 : 15 – 6

We can subtract by starting from 15 and counting 6 steps backwards.

6 5 4 3 2 1

We reach 9.

So 15 – 6 = 9

A. Subtract the following by counting backwards.

1. 11 – 3 =

2. 13 – 5 =

3. 14 – 4 =

4. 16 – 6 =

B. Now do it mentally.

5. 12 – 6 =

6. 14 – 8 =

7. 16 – 6 =

8. 18 – 8 =

9. 17 – 9 =

10. 15 – 8 =

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