You must first regroup the digits in the minuend, when it becomes necessary to subtract a digit from a smaller digit.

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Quizplus · Accepted Answer

This is true because regrouping, also known as borrowing or carrying, is necessary in subtraction when a smaller digit needs to be subtracted from a larger digit. Regrouping involves borrowing a digit from the next place value in order to subtract the smaller digit.

You Must First Regroup the Digits in the Minuend, When