Adding Two- and Three- Digit Numbers

Learn all about adding two-digit numbers and adding three-digit numbers in this free lesson, which includes practice problems.

Using Carrying

On the last page, you practiced adding vertically stacked numbers. Some problems need an extra step. For example, let's look at the following problem:

25 + 39

Our first step is to add the digits on the right— 5 and 9. However, you might notice there isn't room to write the sum, 14. When the sum of two digits in a math problem is greater than 9, the normal way of adding stacked numbers won't work. You'll have to use a technique called carrying.

As you carry, be careful to keep track of the various numbers. If you're writing problems down, be sure to write the carried digits in small print above the column of digits to the left.

Try This!

Solve these problems by carrying. Then, check your answer by typing it in the box.

124 + 36 =
99 + 7 =
165 + 59 =