Page 31 - MTH 1

Subtraction Using Number Line

This method is also called
counting back method.

Subtract 3 from 7 on number line.

3 2 1
jump jump jump

0 1 2 3 4 5 6 7 8 9 10

Start from 7 and count back 3. You will land on 4. So result is

4.

Hence, 7 – 3 = 4

Similarly

4 3 2 1
jump jump jump jump
0 1 2 3 4 5 6 7 8 9 10

9 – 4 = 5

Subtract by counting back method.

6 – 2 =
0 1 2 3 4 5 6 7 8 9

5 – 1 =
0 1 2 3 4 5 6 7 8 9

8 – 7 =
0 1 2 3 4 5 6 7 8 9
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Mathematics In Focus - 1