It means that someone does not know what they are talking about: 3 is not a fraction!
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If you mean 3/4 then as a fraction it is in its simplest form
If you mean 7/3 then it is an improper fraction
If you mean: 126 and 2/3 then it is 380/3 as an improper fraction
If you mean: 0.3 then it is 3/10
If you mean recurring decimal 3 then it is 77/15 as an improper fraction