It depends on what you want to convert to proper fractions. Not all things can be converted to proper fractions.
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You cannot. They are two disjoint subsets of rational numbers.
You can't. Improper and proper fractions are two different things. You can convert an improper fraction to a mixed number.
It is best to convert the mixed fraction to an improper fraction. They are then added together in the same way as proper fractions are added together.
How do you convert fractions to what?
Convert any mixed numbers to improper fractions. Once you have a fraction (proper or improper) do the division. 2/4 = 2 divided by 4 = 0.5