Should we also modify 'twenty-one' for example when it is one hundred and twenty one?
1. Use hyphens with compound numbers between twenty-one and ninety-nine. For example:
- twenty-one
- forty-five
- seventy-seven
- ninety-nine
Also use hyphens to separate numerators and denominators in fractions. For example:
- one-half
- two-thirds
- five-eights
- three-tenths
What about one-and-a-half?
Should we use the hyphen when these numbers above modify nouns, as well as when they don't modify anything?
Thanks