Subtraction with regrouping

Front

What is subtraction with regrouping?

Back

Subtraction with regrouping is a method used to subtract numbers when the top digit is smaller than the bottom digit in any column, requiring borrowing from the next left column.

Front

How do you perform subtraction with regrouping?

Back

1. Start from the rightmost column. 2. If the top digit is smaller than the bottom digit, borrow 1 from the next column to the left. 3. Subtract the digits in each column from right to left.

Front

What is the result of 57 - 24?

Back

33

Front

What is the result of 71 - 39?

Back

32

Front

What is the result of 76 - 59?

Back

17

Front

What is the result of 78 - 39?

Back

39

Front

What is the result of 29 - 11?

Back

18

Front

What does it mean to 'borrow' in subtraction?

Back

To 'borrow' means to take 1 from the next left column when the top digit is smaller than the bottom digit, effectively reducing the left column by 1 and increasing the current column by 10.

Front

Why is regrouping necessary in subtraction?

Back

Regrouping is necessary when the digit in the minuend (the number being subtracted from) is smaller than the digit in the subtrahend (the number being subtracted), ensuring accurate calculations.

Front

Can you give an example of borrowing in subtraction?

Back

In the problem 52 - 27, you cannot subtract 7 from 2. You would borrow 1 from the 5 (making it 4) and add 10 to the 2 (making it 12), then subtract: 12 - 7 = 5.