Correct: 6 + 9, 20 - 5, 5 + 10, 8+ 7, 9+ 6, 3 + 12, 17 - 2, 2 + 13, 1 + 14, 4 + 11, Incorrect: 6 + 2, 10 - 4, 17 +4, 1 + 16, 8 + 9, 3 + 14, 5 + 15, 2 - 17, 1 + 13, 10 - 5, 9 + 5,

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