What is the Greatest Common Factor of 198 and 218?

Greatest common factor (GCF) of 198 and 218 is 2.

GCF(198,218) = 2

We will now calculate the prime factors of 198 and 218, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 198 and 218.

How to find the GCF of 198 and 218?

We will first find the prime factorization of 198 and 218. After we will calculate the factors of 198 and 218 and find the biggest common factor number .

Step-1: Prime Factorization of 198

Prime factors of 198 are 2, 3, 11. Prime factorization of 198 in exponential form is:

198 = 2¹ × 3² × 11¹

Step-2: Prime Factorization of 218

Prime factors of 218 are 2, 109. Prime factorization of 218 in exponential form is:

218 = 2¹ × 109¹

Step-3: Factors of 198

List of positive integer factors of 198 that divides 198 without a remainder.

1, 2, 3, 6, 9, 11, 18, 22, 33, 66, 99

Step-4: Factors of 218

List of positive integer factors of 218 that divides 198 without a remainder.

1, 2, 109

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 198 and 218. The biggest common factor number is the GCF number.
So the greatest common factor 198 and 218 is 2.

Also check out the Least Common Multiple of 198 and 218