Want a personalized pre-algebra experience?
Missions recommend what to learn next, help you remember what you’ve learned by mixing skills, and save your progress.
Sign up

Get Started

Negative number basics
What is a "negative number"? What happens when I add or subtract one of these? If you come to this tutorial armed with the basics of adding and subtracting numbers, you'll learn about what happens in the world below zero! You will learn what negative numbers are and how we can add and subtract them.
Start Learning