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.

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).
Community Questions
All content in “Measurement and geometry”

Line plots

Read and interpret line plots. Also, make some graphs of your own!

Area introduction

Area is how we think about how much space something takes in two dimensions, such as comparing how much land one property takes up versus another. In this tutorial, we'll take a look at how area is measured.

Count unit squares to find area

Find area of shapes by counting unit squares. Some shapes will require combining partial square units to find area. Create rectangles with a given area by covering unit squares.

Multiply to find area

Find area of rectangles by multiplying side lengths. Find a missing side length of a rectangle when given the other side length and area. Compare areas of rectangles presented in images or contexts.

Perimeter

Have you ever wondered how much fencing you need to surround a plot of land? No? Well, you should still go through this tutorial just in case. You'll learn what perimeter is and how to calculate it.

Perimeter word problems

Solve real world problems problems involving perimeter.

Quadrilaterals

Classify quadrilaterals, including rectangles, rhombuses, and squares. See what attributes they have in common and which ones make them unique.