Short Answer: 91 over 45 cannot be simplified.
Long Answer:
Factors of 91: 7, 13, 91Factors of 45: 3, 5, 9, 15, 45
There are no common factors so 91 over 45 cannot be simplified.
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12 over 91 can't be simplified.
It is: 91/119 = 13/17 simplified
45/63 is 5/7 simplified
16/45 cannot be simplified.
It is: 1281/45 = 427/15 simplified