On the Mac, as your profile suggests, there are several ways to introduce numerical superscripts, some better looking than others.
As Peggy has mentioned, the numerical suffixes will give you (sort of) superscripts but the result is half way up the number. That effect is rather insulting to the notion of superscript:

Without that Pages Settings > Auto-Correction choice, one can create the identical result by entering the number, and the text, select that text and then from Format > Font > Baseline > Superscript.
And then there is the equation editor approach which produces a more representative superscript result:

from:

though a simple 1^\mathsf{st} entered in the equation editor would produce the first result above inline with your existing text.