Multi-Digit Addition and Subtraction

Multi-digit addition is the process of adding numbers that have more than one digit, such as 34 + 27.

Multi-digit subtraction is the process of subtracting numbers that have more than one digit, such as 510 - 54.

101

43

210

34

When the sum of a column exceeds 9, you carry over the extra value to the next column.

When the top digit is smaller than the bottom digit, you borrow 1 from the next column to make it larger.

Align the numbers by their place values (ones, tens, hundreds) before adding.

Align the numbers by their place values (ones, tens, hundreds) before subtracting.