Correct: 10 + 0, 10 + 0 + 0, 30 - 20, 5 + 5, 50 - 40, 2 + 8, 1 + 9, 12 - 2, 80 - 70, 56 - 46, 7 + 3, 15 - 5, Incorrect: 9 + 2, 20 + 10, 0 + 11, 30 - 1, 89 - 9, 40 - 20, 70 - 10, 9 - 1, 15 + 0, 11 + 0, 23 - 10, 60 - 10,

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