1.Write the missing numbers.
2.Subtract and colour. 20 - 1 = ....... 20 - 7 = ....... 18 - 8 = ....... 19 - 3 = ....... 20 - 3 = ....... 20 - 5 = ....... 18 - 6 = ....... 19 - 7 = ....... 20 - 4 = ....... 20 - 9 = ....... 18 - 1 = ....... 19 - 4 = ....... 20 - 8 = ....... 20 - 2 = ....... 18 - 5 = ....... 19 - 1 = ....... 13 17 19 20 17 18 10 16 11 12 15 13 12 12 16 16 15 18 3. Make exercises yourself.
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