You need at least two numbers to find a GCF.
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3 x 3 x 11 = 99 3 x 11 x 11 = 363 3 x 11 = 33, the GCF
The Greatest Common Factor (GCF) is: 1
The Greatest Common Factor (GCF) is: 6
the greatest common factor of 55 and 75 is 5
The greatest common factor of 135 and 360 is 45