Correct: 1/5 + 2/5 = 3/5, 10/18 - 1/18 = 1/2, 2/6 + 1/3 = 4/6, 2/6 + 1/3 = 2/3, 1/7 - 1/8 = 1/56, Incorrect: 1/5 + 2/5 = 3/10, 1/5 + 2/5 = 1/5, 17/30 - 12/30 = 1/5, 12/20 + 3/20 = 3/5, 12/20 + 3/20 = 15/40,

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