Correct: 15+15 = 30, 36 - 16 = 20, 56 - 39 = 17, 88 + 12= 100, 100 - 67= 33, Incorrect: 15+15=40, 18 + 18 = 37, 76 - 29 = 54, 100 - 45 = 65, 68+ 21= 99,

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