#### Understanding

Students develop the concept of a unit rate and how to use it to compare amounts in given different ratios.

### What to look for

As students explore unit rates, remind them that to find equivalent ratios, they must multiply or divide both terms of the ratio by the same positive number.### Sample Assessment

It took 7 hours to mow 4 lawns, each with about the same area.

a. What is the rate at which lawns were being mowed?

Answer: (7/4) hours to mow one lawn or 1 and (3/4) hours per lawn.

b. How many lawns could be mowed in 35 hours?

Answer: 20 lawns