Lesson objective: Apply conversions of measurement systems using ratio relationships to a real-life situation.

This lesson provides an opportunity for students to apply their knowledge and understanding of conversions of measurement systems using relationships within ratios to a real-life situation. Students are asked to help students analyze the data collected about snails in science class.

Key Concept students will use:

- Measurement systems involve multiplicative relationships; while a magnitude is invariant, the number we use to describe the magnitude is dependent on the unit of measurement.

Skills students will use:

- Identify multiplicative relationships between quantities
- Use "between" and "within" relationships to find missing values in a ratio table
- Identify multiplicative relationships in conversions between units of measure

Students engage in Mathematical Practice 1 (make sense of problems and persevere in solving them) as they identify an entry point to the task, try multiple strategies to find a solution and use tables to represent their thinking.

**Key vocabulary: **

- "between" relationship
- measurement system
- multiplicative
- "within" relationship