Ratio Line

First term:

Second term:

Steps:

Top label:

Bottom label:

Drag the handle to a multiple. Both lines change together, so the ratio between the readings never changes.

1 : 4

About

A double number line shows a ratio as two aligned scales. The top line counts multiples of the ratio's first term and the bottom line the same multiples of the second, so every vertical pair is the same ratio.

The bottom value under the top value of 1 is the unit rate.