What is subtraction? For example, 5 - 1 = 4, , , What is subtraction? For example, 2 - 1 = 1, , , What is subtraction? For example, 3 - 2 = 1, , , What is subtraction? For example, 5 - 2 = 3, , , What is subtraction? For example, 3 - 2 = 1, , , 3 - 1 = , 5, 2, 5 - 3 =, 2, 7, 8 - 4 = , 4, 10, 10 - 5 = , 1, 5, 10 - 7 = , 3, 7, 15 - 2 =, 2, 13, 14 - 5 = , 9, 20, 18 - 3 = , 15, 8, 16 - 4 = , 1, 12, 20 - 6 = , 14, 19.

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