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To permanently change your number display use Menu -> Edit -> Preferences, then the Appearance, Numbers tab and set the display you wish. For custom formatting within a notebook use NumberForm and its options. Note that the purpose of N is to convert an exact number to an approximate number and it is not intended for number formatting. David Park djmpark at comcast.net http://home.comcast.net/~djmpark/index.html From: Rob Ryan [mailto:tio540s1 at gmail.com] My frustration is growing. I simply want to add (for example): 103971.66+52282.64+2998.27. These are dollars and cents and I'd like to keep the cents. But when I input that line, I get 159923. When I input: N[(103971.66+52282.64+2998.27),20] I STILL get 159923. What do I do to get 159952.57? I've used "SetPrecision", etc. with still no result. I note that when I type 103971.66 and hit shift-return, the output is 103972. If I then type "InputForm[%]" I get 103971.66. There simply has to be an easy way to add these numbers - any calculator watch can do it!