Corretto: 2 + 7 = 9, 3 + 4 = 7, 10 - 5 = 5, 19 - 2 = 17, 4 + 6 = 10, 7 - 5 = 2, 18 - 3 = 15, 11 - 4 = 7, 11 + 4 = 15, Errato: 2 + 7 = 11, 3 + 4 = 1, 10 - 5 = 6, 19 - 2 = 7, 4 + 6 = 8, 7 - 5 = 1, 18 - 3 = 16, 11 - 4 = 9, 11 + 4 = 16,

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