# Lesson 8

Solve Problems with Multiplication and Division

### Lesson Purpose

The purpose of this lesson is for students to practice solving multi-step problems using all operations. Students interpret their solutions (including remainders in division situations) and determine the reasonableness of their answer for a given situation.

### Lesson Narrative

In the previous lesson, students solved word problems involving multiplicative comparison. In this lesson, they practice solving a wider variety of problems, with a focus on the relationships among multiple quantities in a situation. Students think about how to represent the relationships with one or multiple equations and using multiple operations. They also interpret their solutions and the solutions of others in context, including interpreting remainders in situations that involve division (MP2). Students also have opportunities to make estimates and to assess their reasonableness when solving problems.

If students need additional support with the concepts in this lesson, refer back to Unit 6, Section D in the curriculum materials.

• Engagement
• MLR8

### Learning Goals

Teacher Facing

• Determine if a solution to a word problem is reasonable using mental strategies and estimation.
• Interpret remainders in word problems involving division.
• Solve multi-step word problems using the four operations.

### Student Facing

• Let’s make sense of situations and solve word problems.

### 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

What evidence do you have from student discussions that students used estimation strategies to make sense of problems and explain their thinking? How did students explain their estimates and how did they critique the estimates of others?