Lesson 13
Situations Involving Equal-size Groups
Lesson Purpose
Lesson Narrative
In grade 3, students learned about the relationship between multiplication and division and reasoned about division in terms of equal groups. They also saw two interpretations of division: as a way to find the size of a group and as a way to find the number of groups. They used these understandings to find quotients and to reason about division problems in context, finding whole-number quotients from two-digit dividends and one-digit divisors.
In this lesson, students build from the skills and ideas learned in grade 3 as they recall strategies for reasoning about division problems in context (MP2). Students encounter situations that involve equal-size groups and that call for finding the size of a group and the number of groups. The work here prepares students to rely on the relationship between division and multiplication to solve problems involving three-digit dividends in the next lesson.
- Action and Expression
- MLR2
Learning Goals
Teacher Facing
- Reason about division of two- and three-digit numbers in situations involving equal-size groups.
Student Facing
- Let’s interpret and solve division problems.
Required Preparation
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
Suggested Centers
- Five in a Row: Multiplication (3–5), Stage 3: Two-digit Factors (Addressing)
- Compare (1–5), Stage 4: Divide within 100 (Supporting)