# Lesson 5

### Lesson Purpose

The purpose of this lesson is for students to add and subtract within 10.

### Lesson Narrative

Students add and subtract in a way that makes sense to them as they learn a new stage of the center, Check it Off, and then choose from other center activities introduced in previous lessons. They may use their knowledge of the counting sequence, count all, count on, or count back to find the sum or difference. This lesson provides an opportunity to collect formative assessment data on how students are developing methods for adding and subtracting within 10 that build toward fluency.

Math Community

In the lesson synthesis, students use their Mathematical Community poster to create norms for the classroom.

• Action and Expression
• MLR8

Activity 1: Introduce Check it Off, Subtract within 10

### Learning Goals

Teacher Facing

• Add and subtract within 10 in a way that makes sense to them.

### Required Materials

Materials to Gather

Materials to Copy

• Check It Off Stage 2 Recording Sheet

### Required Preparation

Activity 1:

• Each group of 2 needs a set of Number Cards 0-10.

Activity 2:

• Gather materials from previous centers:
• Counting Collections, Stage 1
• Number Race, Stage 3
• Check it Off, Stages 1 and 2
• Five in a Row: Addition and Subtraction, Stages 1 and 2

Building On

### Lesson Timeline

 Warm-up 10 min Activity 1 20 min Activity 2 20 min Lesson Synthesis 10 min Cool-down 0 min

### Teacher Reflection Questions

Reflect on how comfortable your students are asking questions of you and of each other. What can you do to encourage students to ask questions?