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Well how the hell did you just type them?!

Just kidding – I don't think there is a universal key for them, but some fonts will contain them as characters, if they have an extensive enough set.

If was designing a document for print, I'd edit them myself using a combination of kerning, baseline shift and reducing the to point size.
 
Point your mouse over to 'Edit' in the menu bar, at the bottom there is the 'Special Character...' option.

When that loads, make sure the top left drop down is 'Roman', then select 'Digits'.

You can put these into that 'Favorites' tab by selecting the character and going to the very bottom left of the window, and clicking the little cog.
 
I found fractions here, edit>special characters>search>fractions. But I can't seem to cut & paste them into an email. Nor do I see a keystroke shortcut. Any help? I'm using OSX.9.2
 
I found fractions here, edit>special characters>search>fractions. But I can't seem to cut & paste them into an email. Nor do I see a keystroke shortcut. Any help? I'm using OSX.9.2

I know that this is old, and now we have a different system, but the answer is the same. Once you get into the character palate, just double-click on the symbol you want, and the symbol (fraction, in this case) will appear at the point of your cursor in the document — no cut and paste necessary. Very simple and easy to use, but not particularly intuitive.

BTW, the command for getting into the character palate has been renamed "Emoji & Symbols" in Yosemite. But it is in the same location in the menu, and it mostly works the same way.
 
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