31th or 31st is correct?

31th or 31st
101th or 101st
1001th or 1001st

Can I also use that way everywhere in the same way (for example, ordinal numbers in math)?


I think the 101st Airborne Division (U.S. Army infantry division trained for air assault) is a defining case for “standard” usage.

Having said that, in light of 6800 written instances of 101th I can’t say the alternative is “wrong”.

Source : Link , Question Author : kuzey beytar , Answer Author : MetaEd

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