fraction number format?

How can a numeric field display results in fractions? If my recipe data
requires 1/2 cup of something, for example, I'm willing to punch in 0.5 in
the quantity field then select cup in the unit field, but it is more
aesthetically cool to display the number like any paper cook book would--in
plain old regular fractions. I didn't see a format to select to show
fractions. Excel has no problem displaying fractions. Any ideas?

Thanks.


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