What is the Greatest Common Factor of 111 and 129?

Greatest common factor (GCF) of 111 and 129 is 3.

GCF(111,129) = 3

We will now calculate the prime factors of 111 and 129, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 111 and 129.

How to find the GCF of 111 and 129?

We will first find the prime factorization of 111 and 129. After we will calculate the factors of 111 and 129 and find the biggest common factor number .

Step-1: Prime Factorization of 111

Prime factors of 111 are 3, 37. Prime factorization of 111 in exponential form is:

111 = 3¹ × 37¹

Step-2: Prime Factorization of 129

Prime factors of 129 are 3, 43. Prime factorization of 129 in exponential form is:

129 = 3¹ × 43¹

Step-3: Factors of 111

List of positive integer factors of 111 that divides 111 without a remainder.

1, 3, 37

Step-4: Factors of 129

List of positive integer factors of 129 that divides 111 without a remainder.

1, 3, 43

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 111 and 129. The biggest common factor number is the GCF number.
So the greatest common factor 111 and 129 is 3.

Also check out the Least Common Multiple of 111 and 129