A common factor of 99 and 108 is 3.
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Since 36 is a factor of 108, all of its factors are common.
The greatest common factor of 108 and 144 is 36.
The greatest common factor of 108 and 117 is 9.
The Greatest Common Factor of 81, 108, 117: 9
Since 108 is a factor of 432, it is automatically the GCF.