Why the 81 part uses a hyphen
Compound numbers from 21 through 99 join the tens word and the ones word with a hyphen. In 81, the 81 part combines eighty and one, producing eighty-one.
Number Digit tool
Learn how to write 81 in English words, see the correct spelling, and move to the previous or next number.
81 in words is eighty-one.
| Style | Words |
|---|---|
| American English | eighty-one |
| British English | eighty-one |
Compound numbers from 21 through 99 join the tens word and the ones word with a hyphen. In 81, the 81 part combines eighty and one, producing eighty-one.