You cannot.
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4/5 is a proper fraction. Proper fractions can't become improper fractions; it wouldn't be proper.
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)
To change an improper fraction to a proper fraction a person has to find the lowest common denominator. For example, the fraction 3/6 can be broken down to 1/2 by dividing the 6 by the 3 and finding the common denominator to be 2.
Improper fractions can't become proper fractions. You can write 13/3 as a mixed number, which is 4 1/3.
Proper fractions are less than 1. Improper fractions are greater than 1. For a proper fraction to become an improper fraction, you would have to add a quantity that would make it greater than 1.