4 3 and 6 have no proper factor in common. Remember that 1 is a factor of every counting number, but not a proper factor of any of them. Greatest common factor questions do not recognise 1 as a proper factor.
When talking of primes neither 1 nor the number itself is regarded as a proper
factor.
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The greatest common factor of 12 and 52 is 4. 52/4 = 13 12/4 = 3
The greatest common factor of the numbers 3, 4, 8 and 9 is 1.
The greatest common factor is 2
The Greatest Common Factor (GCF) is: 4
The Greatest Common Factor (GCF) of 8 and 68 is: 4