subtracting two digit numbers with regrouping

Front

What is regrouping in subtraction?

Back

Regrouping is the process of rearranging numbers when subtracting, especially when the top digit is smaller than the bottom digit in a column.

Front

What is 78 - 39?

Back

39

Front

What is 34 - 19?

Back

15

Front

What is 89 - 50?

Back

39

Front

What is 96 - 28?

Back

68

Front

What is 25 - 19?

Back

6

Front

When do we need to regroup in subtraction?

Back

We need to regroup when the digit in the top number is smaller than the digit in the bottom number in any column.

Front

What is the first step in subtracting two-digit numbers?

Back

The first step is to line up the numbers by place value (tens and ones).

Front

What do we do if we can't subtract a digit?

Back

If we can't subtract a digit, we regroup from the next left column.

Front

What is the difference between 50 and 20?

Back

30