Source: TV411: Episode 115
Funding for the VITAL/Ready to Teach collection was secured through the United States Department of Education under the Ready to Teach Program.
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.
Download and ShareHere 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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