50-40= - 10, 64-21= - 43, 54-27= - 27, 37-18= - 19, 56-27= - 29, 84-59= - 25, 66-27= - 42, 32-15= - 17, 81-36= - 45, 97-28= - 69, 33-15= - 18, 75-26= - 49, 67-29= - 38, 79-29= - 50, 47-19= - 28,

Subtraction with Regrouping (double digits)

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