2-Digit Subtraction - With Regrouping

2-digit subtraction with regrouping is a method used to subtract two-digit numbers where borrowing is necessary when the top digit is smaller than the bottom digit in any column.

To perform regrouping in subtraction, you borrow from the next left column. For example, if you need to subtract 7 from 5, you borrow 1 from the next column, making the 5 into 15 (5 + 10) and reducing the next column by 1.

The first step is to align the numbers vertically by their place values (tens and ones) and then start subtracting from the rightmost column.

If the top digit is smaller than the bottom digit in the ones column, you need to regroup by borrowing from the tens column.

The result of 57 - 20 is 37.

The result of 64 - 28 is 36.

The result of 50 - 22 is 28.

The result of 50 - 21 is 29.

It is important to line up numbers by place value to ensure that each digit is subtracted from the correct corresponding digit, which prevents errors in the calculation.

Borrowing in subtraction is the process of taking 1 from the next left column to make the current column's top digit larger, allowing for the subtraction to be performed.