(eplain.info)Fractions

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4.18 Fractions
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Exercise 11.6 of 'The TeXbook' describes a macro '\frac' for setting
fractions, but '\frac' never made it into plain TeX. So Eplain includes
it.

   '\frac' typesets the numerator and denominator in '\scriptfont0',
slightly raised and lowered. The numerator and denominator are separated
by a slash. The denominator must be enclosed in braces if it's more than
one token long, but the numerator need not be. (This is a consequence of
'\frac' taking delimited arguments; see page 203 of 'The TeXbook' for an
explanation of delimited macro arguments.)

   For example, '\frac 23/{64}' turns '23/64' into 23/64 (you can't see
the difference in the Info file).