# 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!

## Addition and subtraction

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

- Welcome to 3rd grade
- Adding with regrouping within 1000
- Using regrouping to subtract within 1000
- Strategies for adding two and three-digit numbers
- Addition and subtraction missing value problems

## Multiplication and division

Multiplication and division are two of the most important operations to understand in math. If you drink 2 cups of water, 5 times, how much water have you drunk? If you need to divide 9 slices of cake between 3 friends, how much cake does each friend get?

- Division intro
- Multiplication intro
- Relating multiplication and division
- Multiplication facts
- Multiplication table
- Division facts

## Fractions

This will be your first introduction to the idea of fractions. You'll learn what they are and what they can represent. Then in 4th and 5th grades, you'll learn to compute with them.

- Fractions intro
- What fractions mean
- Fractions on the number line
- Fractions and whole numbers
- Equivalent fractions
- Equivalent fractions on the number line

## Measurement and geometry

In 2nd grade, you learned to measure lengths. Now we can measure the length around the edge of an object (perimeter) and how much "space" something takes up on a flat surface (area).

## Place value and rounding

Going a bit deeper with our understanding of place value from 2nd grade. We'll apply this knowledge to learn to round things to the nearest 10 and 100.