What is 91 over 108 in a mixed number?

To convert the improper fraction ( \frac{91}{108} ) into a mixed number, we first divide 91 by 108. Since 91 is less than 108, it does not contain a whole number, so the mixed number is simply ( 0 \frac{91}{108} ). Therefore, ( \frac{91}{108} ) is already in its simplest form as a proper fraction.