High Quality Content by WIKIPEDIA articles! XNUMBERS 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. IN computing, floating point describes a system for representing numbers that would be too large or too small to be represented as integers. NUmbers are in general represented approximately to a fixed number of significant digits and scaled using an exponent. THe base for the scaling is normally 2, 10 or 16.