CORRETTE: 7 + 5 = 12, 5 + 4 = 9, 8 + 2 = 10, 10 - 5 = 5, 8 - 4 = 4, 3 + 7 = 10, 9 - 2 = 7, 7 - 0 = 7, 2 + 4 = 6, 9 + 3 = 12, 6 + 6 = 12, 10 - 2 = 8, 7 + 1 = 8, ERRATE: 8 + 1 = 10, 7 + 7= 10, 9 + 0 = 0, 5 + 5 = 15, 3 + 3 = 7, 10 - 3 = 8, 11 + 1 = 13, 10 - 3 = 5, 20 - 10 = 20, 7 - 7 = 1, 10 - 4 = 4,

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