9 + 1 = - 10, 10 - 5 = - 5, 20 + 5 = - 25, half of 20 = - 10, 6 x 10 = - 60, 200 + 200 = - 400, 100 + 7 = - 107, 15 - 5 = - 10, 2 x 10 + 5 = - 25, 8 x 2 = - 16, 50 + 10 + 10 = - 70, 4 x 5 = - 20, 100 - 10 = - 90, 56 + 6 = - 62, 82 - 2 = - 80,

Flip tiles sums mixed operations

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