I need help trying to find any fractions that are not in simplest form. (there should be a screenshot below. I dont know the hidden word that is supposed to go in the box... Reply if you understand..

Answer:
Denominator is the hidden word.
Step-by-step explanation:
8/18, 9/27, 42/48, 21/70, 14/35, 8/30, 15/39, 18/100, 8/64, 70/98, and 63/81 are all not in simplest form. Their letters (ENAMNIODOTR) unscramble to "denominator."