Question: what is the greatest common factor of the numbers 36 and 42?
Answer: Greatest Common Factor of 36 and 42. Greatest common factor (GCF) of 36 and 42 is 6. We will now calculate the prime factors of 36 and 42, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 36 and 42.