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.
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?
Here's a tip on tipping for all those big tippers. The rule of thumb is that a tip should at least be 15% of the total bill. But that's kind of tough to figure out in your head. However 10% is even easier. Look I'll show you. Can I borrow this for a second? Thank you. Don't get excited, I'm not going to pick up the tab. In order to figure out 10% of your bill, simply take the decimal point and move it over one place to the left. See, this bill is for $15.45, so I take the decimal point and move it over one place to the left and I now know that 10% of $15.45 is $1.54. And if I want to figure out 15%, I just take half of $1.54, about $0.75, and add the two together. That's my tip, about $2.30, and don't be worried if you have to figure it out on a napkin, the waiter or waitress will appreciate that you took the time to treat them right.
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