# Lesson 19

Find the Number that Makes 10 (optional)

## Warm-up: How Many Do You See: Make 10 (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.

### 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.
• “Discuss your thinking with your partner.”
• 1 minute: partner discussion
• Record responses.
• Repeat for each image.

### Student Facing

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

### Activity Synthesis

• “How does the 10-frame help you see different ways to make 10?” (I know that there are 5 squares in each row and 10 squares altogether. I can look at the empty squares to figure out how many more are needed to make 10.)

## Activity 1: Color the Number to Make 10 (15 minutes)

### Narrative

The purpose of this activity is for students to practice finding the number that makes 10 when added to a given number. They can represent this number on their bead tool, fingers, or 10-frame and determine the number that needs to be added to make 10 (MP5).

MLR8 Discussion Supports. During partner work time, invite each partner to read each equation aloud. Listen for and clarify questions about the equations.
Engagement: Develop Effort and Persistence. Chunk the board in the student-facing task into more manageable parts. Check in with students after using a smaller version of the board.
Supports accessibility for: Organization, Attention

### Required Preparation

• Students can use their bead tool from a previous lesson.

### Launch

• Groups of 2
• Give students access to colored pencils, connecting cubes or two-color counters, bead tools, and 10-frames.
• “You are going to play a game with your partner. One partner will color in one of the squares on the board. The other partner will have to figure out which number you need to make 10 with that number and color it in with the same color. Keep playing until you color in all of the matches. Switch partners and colors each time.”

### Activity

• 12 minutes: partner work time
• “Choose your favorite way to make 10 and fill in the equation.”
• 1 minute: independent work time

### Student Facing

• Partner A: Color in 1 number.
• Partner B: Color in the number that makes 10 with the same color.
• Switch colors and roles and repeat.

Choose your favorite way to make 10.
Fill in the equation.

$$10 = \underline{\hspace{1.1 cm}} + \underline{\hspace{1.1 cm}}$$

### Activity Synthesis

• Invite students to share how they figured out the number needed to make 10.
• Display $$10 = 8 + \underline{\hspace{1 cm}}$$.
• “Elena was filling in her equation. She only filled in the number her partner colored. She wrote $$10 = 8 + \underline{\hspace{1 cm}}$$. What number did Elena color in? How do you know?” (She colored in 2. 8 and 2 make 10.)

## Activity 2: Add to Make 10 (10 minutes)

### Narrative

The purpose of this activity is for students to find the number that makes 10 when added to a given number. Students fill in equations with a missing addend. Students choose appropriate tools strategically as they choose from tools used throughout the year (MP5). For some equations, students may not need a tool because they know the composition to make 10, which is discussed in the activity synthesis.

### Required Materials

Materials to Gather

### Required Preparation

• Students can use their bead tool from a previous lesson.

### Launch

• Groups of 2
• Give students access to connecting cubes or two-color counters, bead tools, and 10-frames.
• “Fill in each equation so that they show a way to make 10.”

### Activity

• 4 minutes: independent work time
• 4 minutes: partner work time

### Student Facing

Fill in the equation to show ways to make 10.

• $$10 = 9 + \underline{\hspace{1 cm}}$$

• $$10 = 3 + \underline{\hspace{1 cm}}$$

• $$10 = 5 + \underline{\hspace{1 cm}}$$

• $$10 = 4 + \underline{\hspace{1 cm}}$$

• $$10 = 8 + \underline{\hspace{1 cm}}$$

• $$10 = 7 + \underline{\hspace{1 cm}}$$

### Activity Synthesis

• “How did you choose which tool to use to help you figure out which number you needed to make 10? Were there any problems that you didn’t need to use a tool to figure out?”

## Activity 3: Centers: Choice Time (20 minutes)

### Narrative

The purpose of this activity is for students to choose from activities that offer practice with number and shape concepts. Students choose from 5 centers introduced in previous units. Students can choose to work at any stage of the centers.

• Shake and Spill
• Number Race
• Grab and Count
• What's Behind My Back?
• Pattern Blocks

Students will continue to choose from these centers in upcoming lessons. Keep the materials from each center organized to use each day.

### Required Materials

Materials to Gather

### Required Preparation

• Gather materials from:
• Shake and Spill
• Number Race
• Grab and Count
• What's Behind My Back?
• Pattern Blocks

### Launch

• Groups of 2
• “Today we are going to choose from centers we have already learned.”
• 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.

Shake and Spill

Number Race

Grab and Count

What's Behind My Back?

Pattern Blocks

### Activity Synthesis

• “What can you do to help you be successful when working in centers? What can your partner(s) do to help you be successful? What can your teacher do?”

## Lesson Synthesis

### Lesson Synthesis

“Today we figured out what number we needed to make 10 and showed the ways to make 10 with equations.”

“Tell your partner one way to make 10. Tell them at least 2 ways that you can show it.” (5 and 5. I can show 5 fingers and 5 fingers. 7 and 3. I can show 7 red counters and 3 yellow counters on a 10-frame.)