Watch: What is a number line? A number line can be used to add and subtract. Watch the video to learn what a number line is, and how to use it! A number line is a great way to add and subtract.

This number line represents the values between 0 and 1. Each step increases by 1⁄10 ... This is a difference of 3. There are 6 equal steps. Divide the difference by the number of steps.