# Lesson 15

Addition and Subtraction Expressions within 5

### Lesson Purpose

The purpose of this lesson is for students to develop fluency with adding and subtracting within 5.

### Lesson Narrative

Students move around the room as they find the value of expressions. Students also compare totals and differences of expressions.

If students need additional support with the concepts in this lesson, refer back to Unit 4, Section C in the curriculum materials.

• Engagement
• MLR8

### Learning Goals

Teacher Facing

• Add and subtract within 5.

### Student Facing

• Let’s add and subtract within 5.

### Required Materials

Materials to Gather

### Required Preparation

Activity 1:

• Each student needs one card from the Expression Cards set used in a previous lesson.
• Label each corner of the classroom with a large number: 2, 3, 4, and 5.

Activity 2:

• Each group of 2 needs a set of Expression Cards from a previous lesson.

Activity 3:

• Gather materials from:
• 5-frames
• Bingo
• Geoblocks
• Find the Value of Expressions

### Lesson Timeline

 Warm-up 10 min Activity 1 10 min Activity 2 15 min Activity 3 15 min Lesson Synthesis 5 min Cool-down 5 min

### Teacher Reflection Questions

At what points during the lesson did you learn the most about your students’ thinking? What structures made those points most valuable in learning about your students? How will you use what you learned in tomorrow’s lesson?