# Lesson 1

How Many Groups?

### Lesson Purpose

### Lesson Narrative

In a previous unit, students were introduced to multiplication. They interpreted products as the total number of objects in a given number of groups of equal size. Students represented groups of equal size using drawings, tape diagrams, and arrays.

The purpose of this lesson is to introduce problems that involve putting objects into groups of equal size, starting with “how many groups?” problems. Even though the structure of the problems suggests division, students may use their understanding of multiplication or any strategy that makes sense to them to solve the problems. If students use connecting cubes, encourage them to draw a picture to match their work. In the lesson synthesis, students have a chance to think about how they would define division. The definition and symbol for division will be introduced in subsequent lessons.

- Representation

- MLR8

### Learning Goals

Teacher Facing

- Solve “how many groups?” problems in a way that makes sense to them.

### Student Facing

- Let’s represent and solve problems.

### Required Materials

Materials to Gather

### Required Preparation

### 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

### Suggested Centers

- Rectangle Rumble (3–5), Stage 2: Factors 1–5 (Supporting)
- Five in a Row: Multiplication (3–5), Stage 2: Factors 1–9 (Supporting)