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Do you want to perform some calculation inside of your form? If that is the case inside of this guide you can find out how to perform calculation in the form:

http://www.jotform.com/help/259-How-to-perform-calculation-in-the-form 

In case that you want to achieve something else, please explain in more details what are you trying to achieve. Also provide us ID of your form. 

Feel free to contact us if you have any other questions.