The Greatest Common Factor (GCF) is: 9
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Nine 7x9=63 so 63/9=7 9x9=81 s0 81/9=9
the number 9
To simplify the fraction 81/63, you need to find the greatest common factor (GCF) of both numbers, which is 9. Divide both the numerator and denominator by 9 to get the simplified fraction. Therefore, 81/63 simplifies to 9/7.
The gcf of 37 and 81 is 1 (their only common factor)
9