# Lesson 16

Find the Value of Expressions

### Lesson Purpose

The purpose of this lesson is for students to find the value of addition and subtraction expressions in a way that makes sense to them.

### Lesson Narrative

In previous lessons, students interpreted expressions and connected expressions to story problems and drawings. This is the first lesson where students begin by working with only expressions. Because students have matched expressions to drawings in previous lessons, students may create a drawing to find the value of the expression. Students may also use their fingers or objects to represent the expression and count to find the total or difference.
• Action and Expression
• MLR8

### Learning Goals

Teacher Facing

• Find the value of addition and subtraction expressions.

### Student Facing

• Let’s find the value of expressions.

### Required Materials

Materials to Gather

Materials to Copy

• Number Mat 1–5
• Roll and Add Stage 2 Recording Sheet

### Required Preparation

Activity 3:

• Gather materials from:
• Roll and Add, Stages 1 and 2
• Shake and Spill, Stages 1-3
• Number Race, Stage 1
• Math Stories, Stages 1 and 2

### Lesson Timeline

 Warm-up 10 min Activity 1 10 min Activity 2 10 min Activity 3 20 min Lesson Synthesis 10 min Cool-down 5 min

### Teacher Reflection Questions

In a previous unit, students represented numbers in multiple ways, including using their fingers, objects, and drawings. How did students work with representing numbers prepare them to find the value of expressions in this lesson?

### Print Formatted Materials

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