Addition and subtraction

Learn how to add and subtract three-digit numbers by thinking about ones, tens, and hundreds.
7 exercises available

Learn how to add numbers like 259 + 363. These addition problems are a harder than the ones we've done before because they require regrouping (also called carrying).

Learn how to solve problems like "___ - 237 = 448" where you don't know one of the values in an addition or subtraction equation.