# Lesson 6

### Lesson Purpose

The purpose of this lesson is for students to solve Put Together, Total Unknown problems and write equations to match.

### Lesson Narrative

Put Together, Total Unknown problems have no action, and students must determine that the two addends must be joined to make the total. Students have solved Put Together, Total Unknown story problems in kindergarten as well as through data contexts in the last unit. The first activity uses the Three Reads routine to help students better understand the story problem and how the quantities are related. The second activity introduces the idea that the two addends can be written in either order and that they each represent a specific part of the story.

• Representation

### Learning Goals

Teacher Facing

• Solve Put Together, Total Unknown story problems in a way that makes sense to them.
• Write an equation and explain why it matches a story problem.

### Student Facing

• Let’s solve problems and write equations.

### Required Materials

Materials to Gather

### Required Preparation

Activity 3:

• Gather materials from previous centers:
• Math Stories, Stage 4
• Find the Pair, Stage 2
• What's Behind My Back, Stage 2

Building Towards

### Lesson Timeline

 Warm-up 10 min Activity 1 15 min Activity 2 10 min Activity 3 15 min Lesson Synthesis 10 min Cool-down 0 min

### Teacher Reflection Questions

Identify ways the math community you are working to foster is going well. What aspects would you like to work on? What actions can you take to improve those areas?

### Print Formatted Materials

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