# Lesson 13

## Warm-up: Number Talk: Plus or Minus 1 or 2 (10 minutes)

### Narrative

The purpose of this Number Talk is to elicit strategies and understandings students have for adding or subtracting 1 or 2. When students add or subtract 1 or 2 and see that the result is 1 or 2 more or less in the count sequence, they are looking for and making sense of structure (MP7).

### 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.

• $$7 + 1$$
• $$7 + 2$$
• $$9 - 1$$
• $$9 - 2$$

### Activity Synthesis

• “How can we add or subtract 1 or 2 quickly?” (It’s like counting. $$+1$$ is the number right after, $$- 2$$ is two numbers before.)

## Activity 1: Can You Answer It? (10 minutes)

### Narrative

The purpose of this activity is for students to determine whether or not questions about data can be answered with a given data representation. Students explain why questions can or cannot be answered with the representation. When students explain why some questions can not be answered, they think carefully about the meaning of the data representation, what it allows them to conclude, and what it does not allow them to conclude (MP6).

MLR8 Discussion Supports. Invite students to begin partner interactions by taking turns repeating the questions to each other and responding. This gives both students an opportunity to produce language.

• Groups of 2

### Activity

• “If the question can be answered, circle ‘thumbs up’. If it can’t be answered, circle ‘thumbs down’.”
• 3 minutes: independent work time
• 3 minutes: partner work time

### Student Facing

She showed their responses below.

Han wrote questions about Elena's data.
Decide whether each question can be answered using the data representation.

1. How many students said math is their favorite subject?
2. How many students said writing is their favorite subject?
3. Who said they like reading best?
4. How many students chose reading or science?

### Activity Synthesis

• “What question did you find that cannot be answered? Why can’t it be answered?”
• “How can we change the question so that it can be answered using this representation?”

## Activity 2: Ask Questions (20 minutes)

### Narrative

The purpose of this activity is for students to think of questions that can be answered using the data representation they create as they collect data from the class. Although there are two different sets of data, all of the questions students ask should be able to be answered using either data set. Questions are compiled during the synthesis and will be used in the following activity.

If necessary, use the provided blackline master instead of collecting data from the class. Cut the blackline master in half and give half the class data from Group A and the other half data from Group B.

### Required Materials

Materials to Copy

• Favorite Special Class Data

### Launch

• Groups of 2
• “We are going to take another survey and ask questions about the data.”
• Decide on a survey question the class would like to answer and three possible responses.
• “Record the title of the data representation and each category.”
• Demonstrate recording the titles.
• Divide the class into Group A and Group B. Each partnership should have one person from each group.
• “Group A is going to take the survey first. If you are in Group B, record the data in your book as I record it for all to see.”
• Ask students in Group A the survey question and record the data on the table using tally marks and numbers.
• “Now Group B is going to take the survey and Group A will record the data.”
• Ask students in Group B the survey question and record the data on the table using tally marks and numbers.

### Activity

• “Now, think of as many questions as you can that can be answered using your data representation. Record your questions in your book if you would like.”
• 5 minutes: independent work time

### Student Facing

Our favorite __________________________________________________

category 1

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category 2

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category 3

$$\phantom{\hspace{2.5cm} \\ \hspace{2.5cm}}$$

$$\phantom{\hspace{2.5cm} \\ \hspace{2.5cm}}$$

### Student Response

• “How could you finish this question, ‘How many students chose _____?’”

### Activity Synthesis

• Share and record the students’ questions about their data.
• “Now we will ask our partner some of these questions.”

## Activity 3: Answer Questions (10 minutes)

### Narrative

The purpose of this activity is for students to ask and answer questions about data. Students ask each other questions about the data collected in the previous activity. Most of the questions should be able to be answered using the data representation, however if a question can’t be answered, the students should explain to their partner why they can’t answer the question using the data representation. Connecting cubes should be available to all students, since some questions may require adding within 20.

Action and Expression: Internalize Executive Functions. Invite students to verbalize their questions before they begin. Students can speak quietly to themselves, or share with a partner.
Supports accessibility for: Organization, Conceptual Processing, Language

### Required Materials

Materials to Gather

### Required Preparation

Required preparation:
• Display the list of questions from the synthesis in the previous activity.

• Groups of 2

### Activity

• “Now you will take turns asking and answering questions about your data. The person who goes first shows their data representation to their partner and asks a question about the data. Their partner answers the question and explains how they found the answer. Repeat with another question, then switch roles. If your partner asks you a question that can’t be answered using the data representation, explain why it can’t be answered."
• 7 minutes: partner work time

### Activity Synthesis

• Choose one of the questions from the list created in Activity 2.
• Share responses.
• “Why do we have two different answers to the questions?” (We have two different sets of data.)

## Student Section Summary

### Student Facing

We looked at different ways to show data.
You can show data using tally marks.

You can show data using numbers.