# Lesson 3

Solve Multiplicative Comparison Problems

### Lesson Purpose

The purpose of this lesson is for students to interpret and represent multiplicative comparison situations in which a factor is unknown.

### Lesson Narrative

In previous lessons, students matched descriptions, equations, and discrete diagrams that represented multiplicative comparison. In this lesson, they write multiplication and division equations, draw diagrams, and use their understanding of the relationship between multiplication and division.

• Engagement
• MLR7

### Learning Goals

Teacher Facing

• Represent and solve multiplicative comparison problems, including those involving unknown factors.

### Student Facing

• Let’s solve multiplicative comparison problems.

### Required Materials

Materials to Gather

### Lesson Timeline

 Warm-up 10 min Activity 1 20 min Activity 2 15 min Lesson Synthesis 10 min Cool-down 5 min

### Teacher Reflection Questions

Which representations best supported student learning in today's lesson? What evidence do you have this representation supported the understanding of most students?

### Suggested Centers

• How Close? (1–5), Stage 6: Multiply to 3,000 (Addressing)
• Five in a Row: Multiplication (3–5), Stage 2: Factors 1–9 (Supporting)