# Lesson 6

Division as an Unknown Factor

### Lesson Purpose

The purpose of this lesson is for students to relate multiplication and division and recognize division as an unknown factor problem.

### Lesson Narrative

Previously, students learned to interpret and write division expressions. They connected division to multiplication informally, recognizing that both operations involved equal groups. In this lesson, students analyze related multiplication and division equations to formalize the relationship between multiplication and division. In the lesson synthesis, students learn that the result in a division equation is called a quotient.

• Engagement
• MLR7

### Learning Goals

Teacher Facing

• Explain the relationship between multiplication and division equations.
• Interpret division equations and multiplication equations with a missing factor.

### Student Facing

• Let’s connect division equations to multiplication equations.

### Lesson Timeline

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

### Teacher Reflection Questions

In this lesson, students formally relate multiplication and division for the first time. How is their previous knowledge of multiplication and division supporting them in understanding this relationship?

### Suggested Centers

• Capture Squares (1–3), Stage 6: Multiply with 1–5 (Supporting)
• Five in a Row: Multiplication (3–5), Stage 2: Factors 1–9 (Supporting)