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

Addition and Subtraction to Twenty

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