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This is a great site to solve basic mathematics, algebra, trigonometry, pre-calculus, calculus problems.

This is a search engine, mainly used in math and science to find the results of any type of mathematical problem.

This search engine is very interesting! When it was first introduced to me by a co-worker, I spent a while just exploring. It can connect information tied to a single topic or concept for you; it can be a puzzle to see what the engine collects and try to figure out why it picked that information! For lesson plan ideas for different Math levels, Check out this link: http://www.wolframalpha.com/educators/lessonplans.html