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Mixed numbers can be converted to improper fractions. Improper fractions can be added the same way proper fractions are.
It depends on what you want to convert to proper fractions. Not all things can be converted to proper fractions.
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.
If you express the whole number w, as w/1, then there is no difference whatsoever.
1/15 is a proper fraction. Proper fractions can't become improper fractions. It wouldn't be proper.