>multiply by advance value' process is that a lot of the precision is lost
>if I divide by 1024 first. Multiplying by the advance number first would
>require 24 bit maths routines.
>
>Anybody got any cunning ideas? The calculation must obviously be quite
>quick

This is standard.  Have you taken any numerical algorithms classes in
school?  These would be of great assistance here.

Look for factorizations which can make the multiply/divide faster, or
better, or whatever your goal is.

But then there's always the Bill Clinton method - brute-force.  Do the
x1024 first (hopefully you have the RAM) then the divide.

Andy

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