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Message: [QUOTE="Mark Hubbart, post: 4466645"] Here's a nice page that with a self-explanitory title: "What Every Computer Scientist Should Know About Floating-Point Arithmetic" <[URL]http://docs.sun.com/source/806-3568/ncg_goldberg.html[/URL]> The way money is usually handled is to either use integers for pennies, or use a separate money class which stores money in that way. A nice thing about doing this in Ruby is that once you create your money class, you can add helper methods to Numeric: class Numeric def cents Money.new(self.round) end def dollars Money.new((self*100).round) end end 23.cents #==> $0.23 23.50.dollars #==> $23.50 cheers, Mark [/QUOTE]