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I am developing an app for kids and they will have a variety of problems from percentage problems, absolute value problems, negative number problems, fraction problems, etc. I was hoping to have a description of how to do each type before they began. Does anyone know of a good database where I could get all the descriptions from and then just cite that source?

Thank You

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The only thing that comes to mind for me is Khan Academy, and it's not clear if Khan breaks the problems down into the same units that you desire for your app. In general, Khan already subsumes a huge portion of the demand for these kinds of flash-card-eqsue, math-training resources online. I'm sure they will move to an app soon if not already, and Khan also covers tons of other domains outside of math. I have no idea if you need permission or anything to cite their pages in your app.

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It is Khan Academy (Kahn should be corrected to Khan in your answer) – Kirthi Raman Apr 14 '12 at 16:52
Thanks for catching the typo. I fixed it. – Mr. F Apr 14 '12 at 19:28

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