4/5 is a proper fraction. Proper fractions can't become improper fractions; it wouldn't be proper.
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4 and 4/5 as an improper fraction is 24/5
If you mean 5 and 4/5 then as an improper fraction it is 29/5
4.8 written as a fraction is 4 8/10 or, in simplest form, 4 4/5. As an improper fraction, it can be written as 48 over 10, or 24 over 5.
1 and 1/4 as an improper fraction is 5/4
You cannot change 3/5 into an improper fraction. An improper fraction has a numerator that is greater than the denominator.