A Tip on Tipping

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A Tip on Tipping

In this video segment from TV411 the Question Man discusses how to figure out the amount to tip on a restaurant bill. He shows viewers how to calculate 15% of the total by, first, calculating 10% of the total. Then he explains how this number can be used to figure out 15% of the total.

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Everyday Math (2004)
Teacher Lesson Guide, pp. 105, 462, 920
Teacher Reference Manual, pp. 145-148
Student Reference Book, pp. 69

Teaching Tips

Here are some Frame, Focus and Follow-up suggestions for using this video in a math lesson.

What is Frame, Focus and Follow-up?

Frame: Where have you seen percentages used? What does it mean to consider 50% of something? What about 10% of an amount? If you had 50% of a dollar, how much money do you have? How about if you had 10% of a dollar?

Focus: Watch the steps the Answer Man takes as he calculates 15% of $15.45. Use a paper and pencil to work along with him and follow the steps. Does the answer make sense? How do you know?

Follow Up: Why does the Answer Man move the decimal point as he figures out the tip on $15.45? Try to use the same method the Answer Man used to figure out a 15% tip for a $20.00 total bill. Is it possible to do it in your head? How?

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