See

http://www.mcgimpsey.com/excel/pennyoff.html

In article ,
Overlanda wrote:

Put this into a cell and change the format of the cell to number with 16
decimal places...

=1131.97-1123

The answer is 8.9700000000000300

Notice the 3 at the 14th place after the decimal.

Haha what a joke.

I have tried on two Excel 2003 boxes - one with SP1 and one without. Both
calculated it incorrectly