Is it me, am I imagining something here? Working in Quicken yesterday I had to pull up the Panther calculator to do some double checking. Twice I entered a whole bunch of stuff to get this extra .0000000000001 in the calculation. Finally I watched carefully each entry I put in. When I got to this one is where it would produce the "errata". I even used my T3's calculator to double check this one and it didn't seem to do this.

Try this for yourself and let me know if you get the same results.

Updated 8/12/04: See this article and see this Apple article on "rounding errors".