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Message: [QUOTE="rpardee, post: 4512979"] Hey All, Looking at the google groups archive for this group, it seems that there's no built-in way to round a float to a particular number of decimal points. I thought I'd use that as an occasion to try my hand at extending a built-in class, and wrote this: class Float def round(places) num = ("1" + "0"*places.to_i).to_f (self*num).round/num end end But when I say: p = 22.0/7 puts p.round(3).to_s Ruby comes back with: C:/Documents and Settings/pardre1/Desktop/DelMe.rb:4:in `round': wrong number of arguments (0 for 1) (ArgumentError) from C:/Documents and Settings/pardre1/Desktop/DelMe.rb:4:in `round' from C:/Documents and Settings/pardre1/Desktop/DelMe.rb:9 What am I doing wrong? Thanks! -Roy [/QUOTE]