Correct spelling, explanation: the correct form is 101st. Ordinal numbers indicate the position or rank of something in a list, as opposed to cardinal numbers, which denote quantity. In English, ordinal numbers have specific suffixes that are attached based on the number’s final digit. The suffix in 101st follows the rule for numbers ending in 1, which is to use -st. Although 101 includes the number 100, it’s treated the same way as 1st because the final digit is still 1. 101th is not correct.

Definition of 101st:
Ordinal number of one hundred one in counting order
She proudly crossed the finish line in 101st place during the marathon.
The company is celebrating its 101st anniversary with a grand event for employees and clients.

Collocations with 101st:
Some of the most commonly used collocations include:
1. 101st place: refers to a ranking in a competition, race, or list, typically in sports or contests.
After a grueling 10K run, John finished in 101st place, just missing the top 100.
2. 101st anniversary: celebrating 101 years since an event or founding date.
The university marked its 101st anniversary with a week-long cultural festival.
3. 101st edition: the 101st release of a publication, such as a book, magazine, or event.
The 101st edition of the magazine featured interviews with industry leaders.
4. 101st birthday: celebrating someone’s 101st year of life.
The family gathered to celebrate Grandma’s remarkable 101st birthday.

Incorrect spelling, explanation: you can’t spell 101st as 101th because of the rules of English ordinal numbers, which depend on the last digit of the number, not the entire number itself. Ordinal suffixes (-st, -nd, -rd, -th) are determined by the last digit of the number, regardless of how many digits the number has. Numbers ending in 1 (except for 11) take the suffix -st. Since 101 ends with 1, it follows the same pattern as 1st. Numbers like 11, 12, and 13 break the usual rule and use -th (11th, 12th, 13th) due to their unique historical pronunciation, but 101 is not an exception, so it follows the typical -st rule. 101st is the only correct form.

Incorrect spelling

Incorrect spelling