By looking at the number line, you can see how far 100 and 1000 are away from each other. Take a look at the examples below to see how you can use number lines to estimate, work out and write numbers.

Yasuko Yamaguchi helps students add two numbers using an open number line. Yasuko Yamaguchi helps students add two numbers using an open number line. Let's Learn is available to stream on pbs.org ...