I've seen handouts that get distributed at the beginning of first-year calculus courses spelling out the rules of adding & multiplying fractions (among other things), and all the mistakes that are made by students coming out of high school. I think that was mostly based on instructors' experiences but now it looks like there's a study to back it up. considering all the simplifying one needs to do in calculus it comes as no surprise:(adsbygoogle = window.adsbygoogle || []).push({});

http://www.sciencedaily.com/releases/2012/06/120615114057.htm

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# Knowledge of division & fractions indicates math success

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