It gives great arithmetic!
From adding and subtracting, to multiplying and dividing, this calculator for OSX does it all. Square roots are no problem, heck, even nth roots are no problem for this handy utility. I am especially fond of the display that makes numbers, variables, functions, and operators all visible and easy to locate to use in even the most arduous calculations. Never again will I have to count on my fingers to do the painful computations of everyday life.
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PCalc