how to spell ordinal numbers — How to Spell
second - last two letters are 'nd' put after 2 = 2nd. third - last two letters are 'rd' so put after 3 = 3rd. 4th - last two letters are 'th' so put after 4 = 4th. We just add 'th' to teen numbers: 14th = fourteenth (fourteen + th) 15th = fifteenth (It's her fifteenth birthday.) 16th = sixteenth. 17th = seventeenth.
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