If you're seeing this message, it means we're having trouble loading external resources for Khan Academy.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

To log in and use all the features of Khan Academy, please enable JavaScript in your browser.

8th grade (U.S.)

Explore

Topics

Numbers and operations

Solving equations with one unknown

Linear equations and functions

Systems of equations

Data and modeling

See descriptions

Want a personalized 8th grade (U.S.) experience?

Missions recommend what to learn next, help you remember what you’ve learned by mixing skills, and save your progress.

Staff picks

Intro to equations with variables on both sides

Equations with variables on both sides

Equations with variables on both sides

Equations with variables on both sides

Solve linear systems of equations

Systems of equations word problems

Scientific notation

Scientific notation intro

Interpreting two-way tables

Get Started

Repeating decimals

Learn how to convert between repeating decimals and fractions.

Table of contents

Numbers and operations

Math is all about numbers (like 89 and 3.14) and operations (like addition and multiplication). In these tutorials, we learn about a some new types of numbers and some new types of operations.

Repeating decimals

Square roots & cube roots

Irrational numbers

Approximating irrational numbers

Negative exponents

Exponent properties

Working with powers of 10

Scientific notation intro

Arithmetic with numbers in scientific notation

Scientific notation word problems

Solving equations with one unknown

Learn how to solve more complicated, multi-step equations like 4x + 5 = 6x -7.

Equations with variables on both sides

Equations with parentheses

Number of solutions to equations

Equations word problems

Equations & geometry

Linear equations and functions

Linear equations like y = 2x + 7 are called "linear" because they make a straight line when we graph them. These tutorials introduce you to linear relationships, their graphs, and functions.

Graphing proportional relationships

Solutions to linear equations

Slope-intercept form

Functions & function notation

Recognizing functions

Linear and nonlinear functions

Systems of equations

A "system of equations" is when we're dealing with more than one equation at the same time. These tutorials show you how to set up and solve systems of equations.

Intro to systems of equations

Systems of equations with graphing

Solving systems with elimination

Solving systems with substitution

Systems of equations word problems

Thinking about solutions to systems

Geometry

In this topic, we will learn about special angles, such as angles between intersecting lines and triangle angles. Next, we will learn about the Pythagorean theorem. We will find volume of 3D shapes like spheres, cones, and cylinders. Finally, we will learn about translations, rotations, reflections, and congruence and similarity.

Angles between intersecting lines

Triangle angles

The Pythagorean theorem

Pythagorean theorem proofs

Congruence and similarity

Data and modeling

In this topic, we will learn about scatter plots, lines of best fit, and two-way tables.

Introduction to scatter plots

Interpreting scatter plots

Estimating lines of best fit

Community questions