XNUMBERS
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XNUMBERS (site) is a multi-precision floating point computing and numerical methods library for Microsoft Excel. Xnumbers is an open source Excel addin (xla) that performs multi-precision floating point arithmetic from 15 up to 200 significant digits. It is compatible with Excel 2000/XP and consists of a set of more than 300 functions for arithmetic, complex, trigonometric, logarithm, exponential calculus.