Unit 1

More Questions about Scaled Bar Graphs

Lesson 8

Introducing Multiplication

Expressions and Equations

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Let’s solve problems using data shown on bar graphs.

Unit 1 ● Lesson 8

Learning

Goal

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Repeated Addition

Unit 1 ● Lesson 8 ● Warm-up

Find the value of each expression mentally.

• 2 + 2 + 2 + 2 + 2
• 2 + 2 + 2 + 2 + 2 + 2
• 5 + 5 + 5 + 5 + 5 + 5
• 5 + 5 + 5 + 5 + 5 + 5 + 5

Number Talk

Slides are CC BY NC Kendall Hunt Publishing. Curriculum excerpts are CC BY Illustrative Mathematics.

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New School Year

Unit 1 ● Lesson 8 ● Activity 1

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• Read the data displayed by this graph. What is this graph about?
• Read and interpret the graph a second time. What quantities are represented? What can be counted or measured in this situation?
• How many more students are excited about the new school year than are nervous or curious? What are some strategies we can use to solve this problem?

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Launch

Slides are CC BY NC Kendall Hunt Publishing. Curriculum excerpts are CC BY Illustrative Mathematics.

New School Year

Unit 1 ● Lesson 8 ● Activity 1

A group of students were asked, “How are you feeling about the new school year?” Their responses are shown in this bar graph:

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How many more students are excited about the new school year than are nervous or curious?

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Slides are CC BY NC Kendall Hunt Publishing. Curriculum excerpts are CC BY Illustrative Mathematics.

New School Year

Unit 1 ● Lesson 8 ● Activity 1

How did reading the problem three times help you make sense of the problem?

3

Activity Synthesis

Slides are CC BY NC Kendall Hunt Publishing. Curriculum excerpts are CC BY Illustrative Mathematics.

Use Bar Graphs to Solve Problems

Unit 1 ● Lesson 8 ● Activity 2

What types of plants do you see on your way home from school?

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Launch

Slides are CC BY NC Kendall Hunt Publishing. Curriculum excerpts are CC BY Illustrative Mathematics.

Use Bar Graphs to Solve Problems

Unit 1 ● Lesson 8 ● Activity 2

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The bar graph shows how many of each type of tree Clare saw on the way home. Use the graph to answer the questions. Show your thinking using expressions or equations.

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• How many more pine trees did Clare see than fir trees?
• How many more pine trees did Clare see than oak or maple trees?
• How many fewer oak trees did Clare see than pine trees?
• How many fewer maple or oak trees did Clare see than fir trees?

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Slides are CC BY NC Kendall Hunt Publishing. Curriculum excerpts are CC BY Illustrative Mathematics.

Use Bar Graphs to Solve Problems

Unit 1 ● Lesson 8 ● Activity 2

How are these methods the same? How are they different?

3

Activity Synthesis

Slides are CC BY NC Kendall Hunt Publishing. Curriculum excerpts are CC BY Illustrative Mathematics.

More Questions about Scaled Bar Graphs

Unit 1 ● Lesson 8

• How did you use what you know about tens and ones to solve the problems?
• In the future, how could you use the Three Reads strategy on your own, without a partner?

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3

Lesson Synthesis

Slides are CC BY NC Kendall Hunt Publishing. Curriculum excerpts are CC BY Illustrative Mathematics.

Reading Time

Unit 1 ● Lesson 8

A group of students were asked, “What is your favorite time to read?” Their responses are shown in this bar graph:

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Use the graph to answer the questions.

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• How many fewer students like to read in the morning than in the afternoon? Show your thinking using expressions or equations.

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• How many more students like to read in the evening than in the morning or at lunchtime? Show your thinking using expressions or equations.

3

Cool-down

Slides are CC BY NC Kendall Hunt Publishing. Curriculum excerpts are CC BY Illustrative Mathematics.

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Slides are CC BY NC Kendall Hunt Publishing. Curriculum excerpts are CC BY Illustrative Mathematics.