Lesson objective: Represent a situation using a ratio, in multiple different ways.

This lesson helps to build fluency with writing ratio statements. The distinction between part-to-part and part-to-whole relationships is used here because it supports students' development of the multiple ways to represent the same situation. This work develops students' understanding that a ratio is a comparison by division.

Students engage in Mathematical Practice 4 (model with mathematics) as they apply ratio reasoning to a real life situation.

**Key vocabulary:**

- part-to-part
- part-to-whole