Students learn about writing ratios in their simplest form using the highest common factor.

As learning progresses students work with ratios involving time, metric units and currency notation.

**Differentiated Learning Objectives**

- All students should be able to write a ratio in a simpler form using a common factor.
- Most students should be able to write a ratio in its simplest form using the highest common factor.
- Some students should be able to use equivalent ratios to solve problems involving currency.