Lesson objective: Apply multiplication and division of rational numbers to solve problems about investment.

This lesson provides an opportunity for students to apply their knowledge and understanding of multiplication and division of rational numbers to a real-life situation. Students are asked to calculate missing values in a table summarizing gains and losses from stock investments.

Key Concepts students will use:

- We can use the number line to represent multiplication with negative numbers.
- We can use the number line to represent division with negative numbers.

Skills students will use:

- Multiplying and dividing with negative numbers
- Solving problems with unit rates (Grade 6, Unit 2)
- Multiplying and dividing decimals (Grade 6, Unit 3)

Students engage in Mathematical Practice 2 (Reason abstractly and quantitatively) as they decontextualize and contextualize rational numbers by translating a real-world investment situation to numerical expressions and then interpreting their answers in the context of investments.

**Key vocabulary: **

- opposite
- stock price
- stock shares

**Special materials needed:**