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.

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?

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.

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.

Expressions and patterns

We'll cover a few odds and ends here. In particular, you'll see whether order matters when you multiply and divide. We'll also explore some mathematical patterns.

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?
Community Questions
All content in “Multiplication and division”

Multiplying by tens

As we'll see in this tutorial, multiplying a multiple of 10--like 10, 20, 30, 40, etc.--by a single digit number is not too much more complicated. Common Core Standard: 3.NBT.A.3