# 3rd grade (U.S.)

We know you've been rocking through 2nd grade adding and subtracting all kinds of whole numbers (up to 2 digits, right?). That's awesome! In 3rd grade math we want you to start using bigger numbers and start multiplying and dividing, too. By the way, did you know that some numbers aren’t actually “whole?” They’re “partially whole.” We call them fractions! We want you to start playing around and having fun with those, too. There's also area, perimeter, and place value to be discovered. Whew. We have so much to do and can't wait to do it with you. Let's go!
Community Questions

# Addition and subtraction

Learn how to add and subtract three-digit numbers by thinking about ones, tens, and hundreds.
Community Questions
All content in “Addition and subtraction”

## Adding with regrouping within 1000

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).

## Using regrouping to subtract within 1000

Learn how to subtract numbers like 363 - 259. These subtraction problems are a harder than the ones we've done before because they require regrouping (also called borrowing).

## Strategies for adding two and three-digit numbers

Learn strategies for solving addition problems within 1000.

## Addition and subtraction missing value problems

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