Does it have to be floating point? Does the decimal point move, or is it always in the same place?

If you need 8-digit resolution, it sounds to me that you could get by handling it with 32-bit integers. Just handle it all as a 32-bit integer, then insert the decimal point when you go to display it.

There are 32-bit basic math routines (add, subtract, multiply, divide) in both the Tutorial and code library section.

Regards,
Craig Steiner