21 - 15, 6, 16, 81 - 54, 37, 27, 54 - 16, 38, 48, 43 - 26, 17, 13, 90 - 9, 99, 91, 81, 80, 53 - 14, 49, 41, 39, 31, 62 - 48, 14, 24, 16, 12

Subtraction within 100

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