Students learn how to use ratio notation to convert between exchange rates.

Learning progresses from working with proportions in the form 1 : n to finding conversion factors from a real-life graph.

**Differentiated Learning Objectives**

- All students should be able to calculate proportionate amounts in the form 1 : n.
- Most students should be able to calculate proportionate amounts using equivalent ratios.
- Some students should be able to solve problems involving equivalent ratios in context.