I cannot figure out how to make the fraction format for oddball fractions...

I teach math and need to type fractions like 7/8 or 1/16 and all I can get it

to do is 1/2, 1/4, and 3/4! HELP!

It's because the fractions 1/2, 1/4, and 3/4 are single characters in

most fonts, but other fractions such as 3/8 are not - you must compose

them of three characters: a 3, a slash, and an 8. You can get a similar

effect by making the numerator a superscript, followed by a slash, and

the denominator in a smaller font - but it seems like a lot of work!