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CalcWorks is a very nice calculator implementation. Use it instead of the Apple supplied Calculator desk accessory. It includes numerous features such a scientific functions, RPN mode, etc. It is unique among computer-based applications in that it includes special calculation routines that avoid inaccuracies inherent in floating point math. A simple test for this problem is "1.0 - 0.9 - 0.1". Most calculators and spreadsheets generate an erroneous non-zero result to this a similar calculations. Not CalcWorks!