7/9
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The GCF of 49 and 63 is 7. The greatest common factor is the highest number that divides exactly into two or more numbers. 49: 1, 7, 49 63: 1, 3, 7, 9, 21, 63
The fraction 51 over 8 as a mixed number is 63/8
Purely as a fraction it would be 63 over 20.
63 is an integer, not a fraction.
The GCF is 7.