Question: what is the greatest common factor gcf of 48 and 63?
Answer: Greatest Common Factor of 48 and 63. Greatest common factor (GCF) of 48 and 63 is 3. We will now calculate the prime factors of 48 and 63, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 48 and 63.