The problem with my Excel is that I noticed a sum function that gave a clearly incorrect answer. The sum function (red) adds the yellow and blue values, which anyone with 3rd grade math knows is 257.7. However, the result of the function is 253.3 in the red box.

The yellow and blue boxes are summing many rows of numbers themseves, perhaps that has something to do with it?

Help! It's very difficult to work with Excel when I can't trust the results of the functions I run.

http://i91.photobucket.com/albums/k2...sc/problem.jpg