52-35=, 17, 71-42=, 29, 26-8=, 18, 85-39=, 46, 66-57=, 9, 19-10=, 9, 120-72=, 48, 150-60=, 90, 133-53=, 80, 188-99=, 89

Subtracting using Borrowing

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