Lesson objective: Apply multiplication to put together equal groups of grams, meters, or liters.

This lesson provides an opportunity for students to apply their knowledge and understanding of multiplication to a mathematical situation. Students are asked to figure out how much weight 3 ants lifted on field day and determine who got 1st, 2nd, and 3rd place.

Key Concept students will use:

- We can use multiplication to solve problems involving measurement quantities (including liquid volumes and masses of objects).

Skills students will use:

- Using arrays for foundations for multiplication (Grade 2, Unit 13)
- Exploring equal groups as a foundation for multiplication and division (Grade 3, Unit 1)
- Understanding the relationship between multiplication and division (Grade 3, Unit 7)
- Developing strategies for multiplication and division (Grade 3, Unit 9)

Students engage in Mathematical Practice 1 (Make sense of problems and persevere in solving them) as students will have to make sense of this problem and persevere in solving it as it is a three-step problem. Students may use number lines, tape diagrams, repeated addition, drawing pictures, equations, or some other strategy to solve.

**Key vocabulary: **

- equal groups
- multiplication
- number line
- tape diagram