Keynote
You can raise or lower text in relation to the text next to it by making it superscript or subscript. You can also set a preference to automatically make numerical suffixes (such as st and nd) superscript.
Go to the Keynote app 
on your iPhone.
Open a presentation, select the text you want to change, then tap 
.
Tap 
in the Font section of the controls.
If you can’t see text controls, tap Text or Cell.
Tap a baseline option.
You can set Keynote to make numerical suffixes superscript as you type.
Go to the Keynote app on your iPhone.
Open a presentation, tap 
at the top of the screen, then tap Settings.
Tap Auto-Correction.
Turn on Number Suffixes, then tap Done at the top of the screen.
When this setting is on, if you don’t want a suffix to be superscript, you can manually change the baseline for that text (see the task above).