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I am new to this forum. I've been programing for some time, and now starting my engineering degree. I am trying to find an online utility that will help me grasp the concept of irrational numbers (summary, multiplication, devision etc.) through trial and error. I am looking for an online tool that will give me a yes no answer if a number is rational or irratioonall.

Do you know of any such tools? I Hope this question is in the right stackexchange site.

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    But @Henning, I don't know if it answers the question. The question asks about numbers, I was only extrapolating about arbitrary expressions.2012-08-27

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You can simply try Wolfram|Alpha.