# Lesson 6

Center Day 1 (optional)

### Lesson Purpose

The purpose of this lesson is for students to practice adding and subtracting within 10, 20, or 50.

### Lesson Narrative

This lesson is optional because it is an opportunity for extra practice that not all classes may need. In both activities, students have a choice between 2 centers introduced in previous lessons. Students choose the center they would like to participate in, and work with a partner on that activity. Use this lesson as an opportunity to establish structures for centers for the year, such as how materials will be organized, how many students will work at each center, how students will transition from one center to another, and how students will work together with partners at each center.

Math Community

Tell students they will reflect on their identified norms at the end of this lesson.

### Learning Goals

Teacher Facing

• Learn the structure of center day lessons.
• Practice adding and subtracting within 10 or 20.

### Student Facing

• Let’s add and subtract in center activities.

### Required Materials

Materials to Gather

Materials to Copy

• Number Puzzles Digit Cards
• Number Puzzles Addition and Subtraction Stage 2 Gameboard

### Required Preparation

Activity 1:

• Create one set of digit cards from the blackline master for each group of 2.

Activity 2:

Gather Materials from:

• What's Behind My Back, Stages 2 and 3
• How Close, Stages 13
• Number Puzzles, Stages 1 and 2

### Lesson Timeline

 Warm-up 10 min Activity 1 15 min Activity 2 25 min Lesson Synthesis 10 min

### Teacher Reflection Questions

How can you use what you learned today about your students and the structure of centers to implement centers in your upcoming lessons?