# Lesson 6

Center Day 1 (optional)

## Warm-up: Number Talk: Two More (10 minutes)

### Narrative

The purpose of this Number Talk is to elicit strategies and understandings students have for counting by 2. These understandings help students develop fluency and will be helpful later in the unit when students will need to be able to use skip-counting to find the total number of objects in arrays and to represent arrays with equations.

### Launch

- Display one expression.
- “Give me a signal when you have an answer and can explain how you got it.”
- 1 minute: quiet think time

### Activity

- Record answers and strategies.
- Keep expressions and work displayed.
- Repeat with each expression.

### Student Facing

Find the value of each expression mentally.

- \(2 + 2 + 2\)
- \(2 + 2 + 2 + 2\)
- \(2 + 2 + 2 + 2 + 2\)
- \(2 + 2 + 2 + 2 + 2 + 2\)

### Student Response

For access, consult one of our IM Certified Partners.

### Activity Synthesis

- “Which expressions could represent an even number of objects? Explain.” (They all could. Each 2 is like a pair. You can find each sum by counting by 2.)

## Activity 1: Introduce Write Numbers, Skip Count by 2, 5, and 10 (20 minutes)

### Narrative

The purpose of this activity is for students to learn stage 4 of the Write Numbers center. Students choose to start with 2, 5, or 10. They skip count by that number.

### Required Materials

Materials to Gather

Materials to Copy

- Write the Number Stage 4 Gameboard

### Launch

- Groups of 2
- Give each group a recording sheet.
- “We are going to learn a new way to play the Write Numbers center.”
- “Partner A will choose whether to start with 2, 5, or 10. You will skip count by that number. Write the next 1, 2, or 3 numbers on the gameboard.”
- “Take turns choosing how many numbers to write and then writing them. The player who writes the last number on the gameboard wins.”
- “Then you can play again and have the other partner choose the number you count by."
- “Let's play a round together.”
- Play a round with the class.
- "Now you'll play Write Numbers with your partner.”

### Activity

- 15 minutes: partner work time
- Monitor for how students decide how many numbers to write on their turn.

### Activity Synthesis

- “How did you decide how many numbers to write on your turn?”

## Activity 2: Centers: Choice Time (20 minutes)

### Narrative

The purpose of this activity is for students to choose from activities that focus on skip-counting and addition and subtraction within 1,000.

Students choose from any stage of previously introduced centers.

- Write Numbers
- Target Numbers
- Five in a Row
- How Close

### Required Materials

Materials to Gather

### Required Preparation

Gather materials from:

- Write Numbers, Stage 4
- Target Numbers, Stages 6 and 7
- Five in a Row, Stages 7 and 8
- How Close, Stage 4

### Launch

- “Now you will choose from centers we have already learned. One of the choices is to continue with Write Numbers.”
- Display the center choices in the student book.
- “Think about what you would like to do first.”
- 30 seconds: quiet think time

### Activity

- Invite students to work at the center of their choice.
- 8 minutes: center work time
- “Choose what you would like to do next.”
- 8 minutes: center work time

### Student Facing

Choose a center.

Write Numbers

Target Numbers

Five in a Row

How Close

### Activity Synthesis

- “What did you like about the activities you worked on today?”

## Lesson Synthesis

### Lesson Synthesis

“Today we learned a new way to play Write Numbers. We skip-counted by 2, 5, and 10. Which number did you most like to skip-count by during this center? Why?”