Hey everyone. Excel 2003.

I will frequently add up a range of cells (all dollar amounts that were
typed in manually). When I add those numbers up with the calculator, let's
say they equal $1865.60. Then when I take them and put the same exact
numbers into a Column and do an autosum, the number comes up $1865.60. GREAT!

But when I do an =SUM(... and then highlight the cells containing the same
numbers, the total come up $1865.59 (one penny off). Of course, it's not all
the time. But I've noticed a difference sometimes between AutoSum and
manually entering a forumla (usually by just a penny). Why is this happening
and how can I fix this before I loose my mind? Any help would be
appreciated. THANKS!