How To Write Ordinal Numbers | Britannica Dictionary
https://www.britannica.com/dictionary/eb/qa/How-To-Write-Ordinal-Numbers
WebWhen writing ordinal numbers such as 1st, 2nd, 3rd, etc. you should use the last two letters on the word as it would be if you wrote out the whole word. Below are the ordinal numbers both written out and with digits for 1-20. first 1st; second 2nd; third 3rd; fourth 4th; fifth 5th; sixth 6th; seventh 7th; eighth 8th; ninth 9th; tenth 10th ...
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