e are asked to draw a double number line representing a 1:4 ratio. To do that we will follow the next steps.
1. Draw two parallel lines each ending in arrows, like this:
2. Label the beginning of each line with zero, like this:
3. Label the first line with units, like this:
4. Each corresponding unit in the second line will be the unit in the first line multiplied by 4, since we need a ratio of 1:4
