Why the 99 part uses a hyphen
Compound numbers from 21 through 99 join the tens word and the ones word with a hyphen. In 99, the 99 part combines ninety and nine, producing ninety-nine.
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99 in words is ninety-nine.
| Style | Words |
|---|---|
| American English | ninety-nine |
| British English | ninety-nine |
Compound numbers from 21 through 99 join the tens word and the ones word with a hyphen. In 99, the 99 part combines ninety and nine, producing ninety-nine.