# Lesson 14

Center Day 3 (optional)

## Warm-up: Number Talk: Adding Up to 4 Two-digit Numbers (10 minutes)

### Narrative

This Number Talk encourages students to think about adding multiples of 5 to other multiples of 5 and to look for ways to use the structure of the base-ten system and the properties of operations to mentally solve problems (MP7). The strategies elicited here help students develop fluency with addition within 1,000.

### 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

• Keep expressions and work displayed.
• Repeat with each expression.

### Student Facing

Find the value of each expression mentally.

• $$10 + 15 + 20 + 10$$
• $$5 + 30 + 20$$
• $$15 + 20 + 30$$
• $$25 + 15 + 5 + 15$$

### Activity Synthesis

• “How can you tell which sums will have 0 ones and which sums will have 5 ones?”

## Activity 1: Introduce Picture Books, Find Shapes (15 minutes)

### Narrative

The purpose of this activity is for students to learn stage 3 of the Picture Books center. Students look through picture books and notice and describe shapes they see in the pictures.

### Required Materials

Materials to Gather

Materials to Copy

• Picture Books Stage 3 Recording Sheet

### Required Preparation

Each group of 24 needs at least one picture book that shows a variety of shapes throughout the book.

### Launch

• Groups of 2
• Give each student a recording sheet and each group 24 picture books.
• “We are going to learn a new way to do the Picture Books center.”
• “Your group will look through picture books and notice and describe shapes you see in the pictures. On your recording sheet, you will each sketch the shape you see, describe it, and name it.”

### Activity

• 10 minutes: partner work time
• Monitor for different shapes students notice.

### Activity Synthesis

• “What shapes did you find most often?”

## Activity 2: Centers: Choice Time (25 minutes)

### Narrative

The purpose of this activity is for students to choose from activities that focus on adding and subtracting within 100. Students may also choose to continue working on Picture Books as one of their choices.

Students choose from any stage of previously introduced centers.

• Capture Squares
• Number Puzzles
• Picture Books

### Required Materials

Materials to Gather

### Required Preparation

Gather materials from:

• Capture Squares, Stages 34
• Number Puzzles, Stages 24
• Picture Books, Stage 3

### Launch

• “Now you will choose from centers we have already learned. One of the choices is to continue with Picture Books.”
• 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.
• 10 minutes: center work time
• “Choose what you would like to do next.”
• 10 minutes: center work time

Choose a center.

Capture Squares

Number Puzzles

Picture Books

### Activity Synthesis

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

## Lesson Synthesis

### Lesson Synthesis

“Today we looked for shapes in books and our classroom. What is something you noticed as you looked for shapes?”