If I'm talking about a length of time in a cover letter, let's say 5.5 years, what would be the correct way to write this?
- five-and-a-half years
- 5-1/2 years
- 5.5 years
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five and a half years
No hyphens. Hyphens are for adjective phrases:
It was a five-and-a-half-year journey.
You also don't use the hyphen with the fraction.