Page 59 - Touchpad Mathematics V1.0 C1

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SubtrACtion by Counting bACk

Let us find 8 – 5.

To find 8 – 5, put your finger on 8 and move back 5 steps. You will reach 3.

5 4 3 2 1

1 2 3 4 5 6 7 8 9 10

5
So, 8 – = 3

Exercise 4C

Subtract the following by counting back. one has been done for you.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

1. 7 – 2 = 5 2. 18 – 4 = 3. 9 – 6 = 4. 16 – 1 =

5. 14 – 2 = 6. 12 – 1 = 7. 18 – 5 = 8. 8 – 2 =

9. 18 – 1 = 10. 19 – 4 = 11. 20 – 7 = 12. 15 – 5 =

13. 13 – 7 = 14. 14 – 8 = 15. 16 – 5 = 16. 19 – 8 =

SubtrACtion fACtS

Count the number of objects that are not crossed and fill in the boxes.

Subtraction facts of 1 Subtraction facts of 2

1 – 0 = 1 2 – 0 = 2
2 – 1 = 1
1 – 1 = 0
2 – 2 = 0

Subtraction facts of 3 Subtraction facts of 4
3 – 0 = 3 4 – = 4

3 – 1 = – 1 = 3

– 2 = 1 – = 2
– = 4 – 3 =

– = 0

57
Subtraction up to 20