Q&A #310

Teachers' Lounge Discussion: Teaching percents

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From: ray

To: Teacher2Teacher Public Discussion
Date: 1998121714:25:32
Subject: percents

Claudia quoted the problem correctly:"What percent of 11 is 55?", but set up the problem wrong and is headed for 20% as an answer. The answer is 500% (see the first explanation by Jamie). Which brings up the idea of giving the student a few (say 5) mileposts to memorize: 25% is 1/4 50% is 1/2 100% is all of it 200% is twice as much 1000% is 10 times as much. The student should then be encouraged to always check a calculation against one of the memorized mileposts for reasonableness.

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