Casio announces the official launch of an English-language version of its high-precision calculation Web site, Keisan, which means “calculation” in Japanese. Keisan provides a free online service that allows users to perform a variety of calculations using Casio’s own arithmetic operation system with a variable number of digits. The Library page on the site includes operations necessary for serious math, such as Bessel functions and probability functions, as well as measurement-unit converters, loan calculators, and calendar-related tools.Price: free Category: math
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Casio Giveaway on Twitter

Casio is giving away one PRIZM Graphic Calculator, autographed by New York Times bestselling author and internationally recognized mathematician Danica McKeller, and one Pink fx-9860GII Graphing Calculator on Twitter.