Incorrect spelling, explanation:
22th is an incorrect form because every number which ends with 2 has the suffix nd in its ordinal form. -th is added to every number except 1, 2, and 3 (their suffixes are respectively -st, -nd and -rd). This is why the correct ordinal form of 22 is 22nd.
Correct spelling, explanation: to create an ordinal number from the cardinal one we usually add suffix -th. There are three exceptions, though: for numbers one, two, and three (and all numbers which end with 1,2, and 3). For example, 20 as the ordinal number will be 22nd, but 24 will be 24th. This is why the form
22th is incorrect.
Definition of 22nd:
numeral, the ordinal number between 21st and 23rd
Her birthday is on the 22nd of March.
I started collecting art last year. This painting is my 22nd one.
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