85.4 = 85 4/10 = 85 2/5
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You do the numerator divided by the denominator, then simplify the fractions if you can. (this is how you change a improper fraction to a mixed number, you cannot change a proper fraction to a mixed number)
If its not an improper fraction then you cant....
I don't think you can but, you can change an improper fraction to a decimal.
improper fraction
improper fraction