There is a variety of possibilities - see:

http://www.gmayor.com/createfraction.htm
or
http://gregmaxey.mvps.org/Formatted_Fractions.htm
or
http://www.word.mvps.org/FAQs/Format...teFraction.htm

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Graham Mayor - Word MVP

My web site www.gmayor.com
Word MVP web site http://word.mvps.org