#### Understanding

Students associate the “value” of a ratio with a fraction and connect the unit rate associated with a ratio to a fraction.

### What to look for

The language “part to part” and “part to whole” is deliberately avoided as this language is constraining and limits student thinking as they continue to work with ratios in situations such as those involving slope and similarity.### Sample Assessment

The ratio of people over 45 years of age to those 45 years old and under in a certain region is 3:2. What fraction of the population in the region is 45 years or younger?

Answer: $\frac{2}{5}$