Multiply the whole number by the denominator or the fraction and add that to the numerator.
For example,
2 5/8 = ((2 x 8)+5)/8 = 21/8
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If its not an improper fraction then you cant....
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)
improper fraction
improper fraction
I don't think you can but, you can change an improper fraction to a decimal.