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        Grades

        5-8,13+

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        Using Percents to Calculate Tips

        Students learn to calculate 10% of a number by understanding it as one-tenth of the number. They also learn how to do this by moving the decimal point and how to apply this knowledge to calculating tips.

        Lesson Summary

        Overview

        In this TV411 activity, students learn to calculate 10% of a number by understanding it as one-tenth of a number. Eventually, they observe that calculating 10% can be accomplished by moving the decimal point one place to the left. They also learn to calculate a 15% tip. The video clip reinforces the procedure and shows some estimation strategies.

        Grade Level:

        5-8

        Suggested Time

        1 hour

        Media Resources

        A Tip on Tipping QuickTime Video

        Materials

        Calculating Tips handout
        Assessment: Level A
        Assessment: Level B
        Answer Key

        The Lesson

        Part I: Learning Activity

        1. Read the following to your students: "When you go out to eat it is customary to tip waiters and waitresses for their service. Usually, people tip at least 15%. When you tip, how do you figure it out?" Discuss how students have estimated tips in the past.

        2. Distribute the Calculating Tips handout .

        3. Ask the students to complete the handout.

        4. Discuss the handout. (Note: The video segment emphasizes the procedure and uses estimation informally. Be sure students understand the reasoning from the handout. Also, make sure students don't use calculators or double digit multiplication.)

        5. Play the A Tip on Tipping QuickTime Video .

        6. Discuss the strategy illustrated in the video.

        Part II: Assessment

        Assessment: Level A (proficiency): Students calculate 10% and 5% of given whole numbers.

        Assessment: Level B (above proficiency): Students calculate 15% and 20% of given whole numbers. Then they extend their reasoning to calculate 35% of a whole number.

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