Teacher2Teacher Q&A #5617

Percentages

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From: Ron (for Teacher2Teacher Service)
Date: Jan 31, 2001 at 05:25:59
Subject: Re: Percentages

When I teach this topic I bring in a newspaper and have the students look at the percent type questions in the paper. This is a more "real-time activity" than getting the question out of the text book. Each group of students picks an example of their choice and discusses it with the class. I try to influence their choices so that a wide range of applications are presented. For example: sales, discount, interest charges, bank charges, sales tax, percentages used on the sports page, percentage increase. To answer your specific question: Original Price * Percent Off (expressed as a decimal) = Discount Original Price - Discount = Sales Price Have the students work on getting a one-step solution to this type of problem: Original Price * (1 - percent off (expressed as a decimal)) = sales price Using your example: Two-step solution: Original Price * .30 = Discount Original Price - .3 * Orginal Price = 84.00 .7 * Original Price = 84.00 -------- One step solution Original Price = 84.00/.7 The original price was \$120 Hope this answers your question. Cheers. -Ron, for the T2T service

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