mathmistakes.info
About this Web Site 
This web site is provided to help high school and college/university students eliminate common mistakes and to learn important facts. The approach is not to give a list of the types of those mistakes (see some of the links on the "Links/Other Web Resources" page for such lists), but instead to show examples of such mistakes along with corrections and brief explanations. My hope is that these examples complement what your teachers and texts tell you about correct techniques, and that they will help you eliminate these kinds of mistakes. A second reason students struggle with mathematics is that important basic facts are not known well enough to use them correctly consistently. Just as the multiplication facts are crucial to doing arithmetic, for example, so it is with the basic facts of algebra, trigonometry and calculus. The facts pages on this web site provide flashcards to help students learn these facts as well as pages providing examples of their use and some explanations.
Email address: mistakes [at] mathmistakes [dot] info 
About the Developer 
Russell Blyth is an Associate Professor in the Department of Mathematics and Computer Science at Saint Louis University in St. Louis, Missouri, where he has taught classes at all levels since 1987. (The university has no connection to mathmistakes.info, which is being developed using whatever time can be found during evenings, weekends and holidays after work duties and life obligations have been attended to.) The web site of the Department of Mathematics and Computer Science at Saint Louis University provides information about its degree programs and has resources for teaching and learning mathematics and computer science. Links:

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