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There are some custom functions for doing this on Brian Dunning's site www.briandunning.com Do a search for "fraction"
I wrote some basic routines for this last year that are posted on Brian Dunning's site. The only function I didn't need personally was converting a decimal amount to a fraction but these routines should be a good starting point for you if you have FileMaker Pro Advanced.
Thank you, Order from Chaos and Chris.