Correct spelling, explanation: 42nd stands for ordinal number forty-second. The word forty comes from Old English and, naturally, it refers to the number four. However, it is worth noticing that in 42nd, when written in a full form, there is no -u letter so it’s forty second and not fourty second, as some people think.

Definition of 42nd:
1. ordinal number – short form of number forty second,
Only fifty candidates could get into the university so when he saw that he was 42nd he felt a huge relief.

Expressions with 42nd:
42nd is an ordinal number of forty-two so it usually appears on various lists, charts, and diagrams;
The track used to be in the top 3 of the charts and now is only 42nd.
He ranked 42nd in the marathon – for the first time it is quite a good result.

Incorrect spelling, explanation: when we form ordinal numbers in English we usually add the -th ending to a number. Therefore, we have, for example, 7th, 9th, 45th, and many others. However, the rule doesn’t apply to the first three numbers as we have 1st, 2nd, and 3rd so we also have 42nd. Some English users forget about it and often add the -th ending to these numbers, too. Thus, a common mistake is to write 42nd as 42th, which is wrong.

Incorrect spelling

Incorrect spelling