Page 66 - Enjoy with Maths Primer

S U B T R A C T I O N B Y R E V E R S E C O U N T I N G
SUBTRACTION BY REVERSE COUNTING

20 – 5 = 15

20 19 18 17 16 15

1 2 3 4 5

17 – 3 = 14

17 16 15 14

1 2 3

Observe the above pattern and subtract them:

11 – 1 = 15 – 3 =

13 – 2 = 14 – 2 =

15 – 4 = 16 – 3 =

19 – 4 = 29 – 6 =

66 Maths–Primer

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