Teacher2Teacher 
Q&A #310 
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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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