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Message: [QUOTE="Eric Anderson, post: 4445985"] This seems like such a basic question yet I can't really find the answer anywhere in the docs (I'm probably looking in the wrong place). Anyway I need to compute a percentage and output it. The percentage should be in the form 39.45% (i.e. round to the nearest two decimal places). So I have top = 68 bottom = 271 percentage = (top.to_f / bottom * 100 * 100).round.to_f / 100 The above works but it does not seem very intuitive. What I would rather is: percentage = (top.to_f / bottom).round(4) * 100 But round does not take any arguments on how many decimal places I want. It just assumes I don't want any. Perhaps there is another function that I am not seeing that will round while keeping a certain number of decimal places. Obviously I could also enhance round to take an optional argument but I wanted to see if there was an already existing function in the Ruby std library that will do it for me. Thanks, Eric [/QUOTE]