Correct: 16 - 9 = 7, 15 - 9 = 6, 14 - 9 = 5, 13 - 9 = 4, 12 - 9 = 3, 11 - 9 = 2, 10 - 9 = 1, 15 - 8 = 7, 14 - 8 = 6, 13 - 8 = 5, 12 - 8 = 4, 11 - 8 = 3, 10 - 8 = 2, 14 - 7 = 7, 13 - 7 = 6, 12 - 7 = 5, 11 - 7 = 4, 10 - 7 = 3, 12 - 6 = 6, 11 - 6 = 5, 10 - 6 = 4, 14 - 5 = 9, 13 - 5 = 8, 12 - 5 = 7, 11 - 5 = 6, 10 - 5 = 5, 13 - 4 = 9, 12 - 4 = 8, 11 - 4 = 7, 10 - 4 = 6, Incorrect: 18 - 9 = 8, 17 - 8 = 7, 16 - 7 = 6, 15 - 8 = 9, 14 - 9 = 4, 13 - 7 = 7, 12 - 6 = 5, 11 - 5 = 4, 10 - 3 = 6,

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