Correct: 64 - 57 = 7, 81 - 69 = 12, 61 - 18 = 43, 93 - 44 = 49, 48 - 21 = 27, 4x5 = 20, 8x9 = 72, 7x6 = 42, 5x7 = 35, 3x4 = 12, Incorrect: 64 - 57 = 3, 81 - 69 = 7, 61 - 18 = 41, 93 - 44 = 5, 48 - 21 = 3, 4x5 = 10, 8x9 = 0, 7x6 = 20, 5x7 = 15, 3x4 = 8,

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