WebGreatest common factor (GCF) of 27 and 45 is 9. GCF(27,45) = 9. We will now calculate the prime factors of 27 and 45, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 27 and 45.. Answer: GCF = 4 Greatest Common Factor for the values 8, 12, 20 Solution by Factorization: The factors of 8 are: 1, 2, 4, 8 The factors of 12 are: 1, 2, 3, 4, 6, 12 The factors of 20 are: 1, 2, 4, 5, 10, 20 Then the greatest common factor is 4. You can also find the GCF using Prime Factorization or Euclid's Algorithm. Share this Answer Link: help. ## HCF of 27 and 45|GCF of 27 and 45

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