42th

Incorrect spelling, explanation: forming ordinal numbers in English can be quite confusing. In most cases, we add the -th ending to a number. However, numbers 1, 2, and 3 are formed differently as we have: the first, the second, and the third, which in short is 1st, 2nd, 3rd. As a result, we also have 42nd, but many English users form it as 42th, which is wrong.

42nd

Correct spelling, explanation: an English number 42nd, when written in words, is forty-second. Generally speaking, numbers come from Old English, and in the case of 42nd the root is a number four. It is interesting, though, that we spell the number four with -u in the middle, but 40 is spelled as forty – it is a common mistake to spell it as fourty.

Definition of 42nd:
1. ordinal number (forty-second) – refers to a person or a thing on a list ranked as 42nd,
Please, open your books on the 42nd page.

Phrases with 42nd:
The number 42nd usually appears on a list, chart, etc. and shows the position of something;
You can find the answers on the 42nd page.
He finished the race in the 42nd position, which was really disappointing.

42st

Incorrect spelling

42rd

Incorrect spelling