1. ## a fifth

Hi there,
"A fifth = one fifths = 1 in 5 = 1/5"
In my opinion, they are exactly same to each other, am I right?

Thanks.

2. ## Re: a fifth

It's "one-fifth", not "one fifths". You need the hyphen and to remove the "s".

3. ## Re: a fifth

'1 in 5' is different from the others.

If five people share a cake we don't say they get one in five each.

4. ## Re: a fifth

I thought this was going to be about whiskey. "A fifth" is what Americans call the standard-sized bottle of liquor. Now 750 ml, it was formerly one-fifth of a gallon.

5. ## Re: a fifth

Originally Posted by Rover_KE
'1 in 5' is different from the others.

If five people share a cake we don't say they get one in five each.
We don't say that but it is nonetheless true that if the cake is cut into five and shared equally, they will get "one in five" pieces each. I don't pretend that that is a natural statement at all.

I wasn't suggesting in my first response that they are interchangeable but they do mean the same thing.

6. ## Re: a fifth

Great! Rover, you could notice that. I really thought that they were interchangeable by Emsr2d2 first reply. Anyway! now I knew that they are not interchangeable but mean the same by Emsr2d2 second response. I, however, think that "a fifth" and "one fifth" are interchangeable, while "one in five" and "1/5" are interchangeable too. Am I actually right?

7. ## Re: a fifth

No. 1/5 is how we write 'one fifth' when our keyboard doesn't enable us to type .

8. ## Re: a fifth

"One in five" is the odd one out there. "A fifth", "one-fifth" and "1/5" are the same thing. If we see "1/5", we read it as "one-fifth".

9. ## Re: a fifth

I would not hyphenate "one fifth" unless it were an atributive adjective.

10. ## Re: a fifth

Note that 'a fifth' has other meanings: a musical interval and a spirit measure.

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