How To Write Ordinal Numbers | Britannica Dictionary
https://www.britannica.com/dictionary/eb/qa/How-To-Write-Ordinal-Numbers
webnineteen th 19th. twentie th 20th. As you can see, 1st, 2nd, and 3rd use -st, -nd, and -rd, but 4th-20th use -th. Follow this pattern for the numbers moving forward: 21st, 31st, 41st, etc. all use -st like 1st. 22nd, 32nd, 42nd, etc. all use -nd like 2nd. 23rd, 33rd, 43rd, etc. all use …
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