You can't do this conversion.
Improper Fraction.
proper fraction
You can't. Improper and proper fractions are two different things. You can convert an improper fraction to a mixed number.
A mixed number.
9/8 is an improper fraction.
A proper fraction has a numerator less than its denominator. An improper fraction has a numerator greater than or equal to its denominator. A mixed number combines a whole number with a proper fraction.
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.
Whole number
It is called a mixed number or a mixed fraction.
You can't convert a proper fraction to an improper or mixed fraction - it just doesn't make sense. By definition, a proper fraction is one that is less than one; a mixed fraction - as well as an improper fraction - is less than or equal to one.
15/7 is an improper fraction. It can be re-written as the mixed number: (2 and 1/7)
You could write a fraction as a proper, improper or mixed fraction.