Incorrect spelling, explanation: this is an incorrect form because twenty-second is the full-word form of this ordinal number, therefore it must end with nd (as in second), not th. This points to 22nd as the only correct form. th ending is used in numbers, which end with this sound, for example, 35th (thirty-fifth).
Correct spelling, explanation: 22nd is the correct way to write this ordinal number down, because its full-word form is twenty-second, thus it ends with nd. Taking this into consideration the correct form is 22nd, not 22th, because th ending is used for ordinal numbers which end with th.
Definition of 22nd:
numeral, the ordinal number between 21st and 23rd
I think people won’t work anymore in 22nd century.
Her 22nd birthday party was legendary!
Incorrect spelling
Incorrect spelling
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