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 column.

Front

How do you borrow in subtraction?

Back

To borrow in subtraction, you take 1 from the next left column, decrease that digit by 1, and add 10 to the current column's digit.

Front

What is the first step in solving a subtraction problem with regrouping?

Back

The first step is to line up the numbers by their place values (ones, tens, hundreds) and start subtracting from the rightmost column.

Front

If you have 350 and subtract 176, what is the first column you will work on?

Back

You will start with the ones column, which has 0 in 350 and 6 in 176.

Front

What do you do when you cannot subtract a larger digit from a smaller digit in a column?

Back

You need to borrow from the next column to the left.

Front

In the problem 350 - 176, after borrowing, what does the ones column become?

Back

After borrowing, the ones column becomes 10 (from 0 + 10) and you subtract 6 from 10.

Front

What is the result of 10 - 6?

Back

The result is 4.

Front

After solving the ones column in 350 - 176, what do you do next?

Back

Next, you move to the tens column and subtract the digits there.

Front

In the tens column of 350 - 176, what do you have after borrowing?

Back

You have 4 in the tens column (5 - 1 after borrowing) and you subtract 7 from it.

Front

What do you do if you cannot subtract 7 from 4 in the tens column?

Back

You need to borrow from the hundreds column.