How To Write Ordinal Numbers | Britannica Dictionary
https://www.britannica.com/dictionary/eb/qa/How-To-Write-Ordinal-Numbers
WEBAnswer. When 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. fir st 1st. seco nd 2nd. thi rd 3rd. four th 4th. fif th 5th. six th 6th. seven th 7th. eigh th 8th. nint h 9th.
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