5 + 5 = - 10, 10 - 9 = - 1, 7 - 7 = - 0, 10 - 7 = - 3, 10 - 3 = - 7, 5 + 4 = - 9, 9 - 5 = - 4, 3 + 3 = - 6, 5 + 3 = - 8, 8 - 3 = - 5, 1 + 1 = - 2,

Matching pairs addition and subtraction to 10

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