What is the Greatest Common Factor of 55 and 22?

Greatest common factor (GCF) of 55 and 22 is 11.

GCF(55,22) = 11

We will now calculate the prime factors of 55 and 22, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 55 and 22.

How to find the GCF of 55 and 22?

We will first find the prime factorization of 55 and 22. After we will calculate the factors of 55 and 22 and find the biggest common factor number .

Step-1: Prime Factorization of 55

Prime factors of 55 are 5, 11. Prime factorization of 55 in exponential form is:

55 = 5¹ × 11¹

Step-2: Prime Factorization of 22

Prime factors of 22 are 2, 11. Prime factorization of 22 in exponential form is:

22 = 2¹ × 11¹

Step-3: Factors of 55

List of positive integer factors of 55 that divides 55 without a remainder.

1, 5, 11

Step-4: Factors of 22

List of positive integer factors of 22 that divides 55 without a remainder.

1, 2, 11

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 55 and 22. The biggest common factor number is the GCF number.
So the greatest common factor 55 and 22 is 11.

Also check out the Least Common Multiple of 55 and 22