# Lesson 5

Center Day 1 (optional)

## Warm-up: How Many Do You See: Hundreds, Tens, and Ones (10 minutes)

### Narrative

The purpose of this How Many Do You See is to allow students to use subitizing or grouping strategies to describe the images they see.

Record the ways students see the blocks using equations. For example, if a student said they saw the first image as 2 hundreds, then 5 tens, and then the 4 ones, record this as $$200 + 50 + 4 = 254$$. If a student said they saw the image as 2 hundreds, 3 tens and 2 tens, and then 4 ones, record this as $$200 + 30 + 20 + 4 = 254$$.

### Launch

• Groups of 2
• “How many do you see? How do you see them?”
• Flash the image.
• 30 seconds: quiet think time

### Activity

• Display the image.
• 1 minute: partner discussion
• Record responses using equations. (For example, I saw 234 and 2 more tens. $$234 + 20 = 254$$)
• Repeat for each image.

### Student Facing

How many do you see? How do you see them?

### Activity Synthesis

• “How did the groups help you to know the value of the blocks?” (We described seeing the same kinds of blocks together. People saw hundreds with hundreds, tens with tens, and ones with ones.)

## Activity 1: Introduce Five in a Row, Add within 1,000 without Composing (20 minutes)

### Narrative

The purpose of this activity is for students to learn stage 7 of the Five in a Row: Addition and Subtraction center. Students add within 1,000, without composing tens or hundreds. Partner A chooses two numbers and places a paper clip on each number. They add the numbers and place a counter on the sum. Partner B moves one of the paper clips to a different number, adds the numbers, and places a counter on the sum. Students take turns moving one paper clip, finding the sum, and covering it with a counter. The winner is the first one to get five counters in a row.

### Required Materials

Materials to Gather

Materials to Copy

• Five in a Row Addition and Subtraction Stage 7 Gameboard

### Required Preparation

Each group of 2 students needs 10 counters and 2 paper clips.

### Launch

• Groups of 2
• Give each group two paper clips, counters, and a gameboard.
• “We are going to learn a new stage in the Five in a Row center.”
• “Let’s play one round together. You can all be my partner.”
• “I’ll put a paper clip on two numbers in the grey boxes that we will add and we’ll put a counter on the sum. What is the sum?”
• 1 minute: quiet think time
• Share responses and demonstrate covering the sum on the gameboard with a counter.
• “Then the next player moves one of the paper clips, adds the numbers, and puts a counter on the sum.”
• “Continue taking turns until someone gets 5 in a row.”

### Activity

• 15 minutes: partner work time

### Activity Synthesis

• “What strategies did you use to add the numbers?”
• “What strategies did you come up with for picking your paper clip number?”

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

### Narrative

The purpose of this activity is for students to choose from activities that focus on place value and addition with three-digit numbers.

Students choose from any stage of previously introduced centers.

• Five in a Row: Addition and Subtraction
• Get Your Numbers in Order
• Mystery Number
• The Greatest of them All

### Required Materials

Materials to Gather

### Required Preparation

Gather materials from:

• Five in a Row: Addition and Subtraction, Stages 6
• Get Your Numbers in Order, Stage 2
• Mystery Number, Stage 2
• The Greatest of them All, Stage 2

### Launch

• “Now you will choose from centers we have already learned. One of the choices is to continue with Five in a Row.”
• 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.

Five in a Row: Addition and Subtraction

Mystery Number

The Greatest of them All

### Activity Synthesis

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