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NumeroScreenshot 

 

Numero is a calculator program that does the order of operations, so you can type in the whole expression at once instead of just one number at a time. It has about everything that you would expect to see on a scientific calculator. Also, in addition to the text box that you enter the expression into, Numero has a text box that displays all of the expressions and answers that you have already calculated. The interface is also customizable.

Screenshot of Numero