20 - 1 =, 20 - 2 =, 20 - 3 =, 20 - 4 =, 20 - 5 =, 20 - 6 =, 19 - 10 =, 19 - 9 =, 19 - 8 =, 19 - 7 =, 18 - 8 =, 18 - 7 =, 18 - 6 =, 18 - 4 =, 17 - 3 =, 17 - 7 =, 17 - 10 =, 16 - 8 = , 16 - 6 =, 16 - 2 =, 16 - 0 =, 15 - 4 =, 14 - 13 =, 13 - 6 =, 12 - 9 =, 12 - 1 =, 11- 11 =, 11 - 3 =, 10 - 10 =, 10 - 6 =, 10 - 5 = , 9 - 8 =, 9 - 4 =, 8 - 4 =, 8 -7 =, 7 -5 =, 7 - 3 =, 6 - 6 =, 6 - 4 =, 5 - 2 =, 4 -1 =, 4 - 4 =, 3 - 0 =, 2 - 1 =, 1 - 1 =, 1 - 0 =.

Subtraction up to 20

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