11 + 12, 16 + 18, 25 + 42, 25 + 13, 43 + 15, 36 + 15, 16 + 38, 27 + 28, 66 - 21, 84 - 28, 69 - 41, 80 - 32, 92 - 36, 84 - 32, 51 - 28, 53 - 16, 47 - 14, 38 - 17, 62 - 13, 58 - 12, 58-19, 13 + 50, 19 + 40, 17 + 60, 30 + 18, 16 + 50, 46 + 10, 30 + 10, 83 + 30, 36 + 20, 44 + 30, 12 + 85, 76 - 66, 81 - 12, 44 - 18, 36 + 28, 67 + 29, 12 + 17, 32 - 18, 93 - 55, 12 + 17, 33 + 19, 36 - 10, 44 - 17, 40 - 12.

Addition and subtraction with regrouping

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