What is the Greatest Common Factor of 655 and 660?

Greatest common factor (GCF) of 655 and 660 is 5.

GCF(655,660) = 5

We will now calculate the prime factors of 655 and 660, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 655 and 660.

How to find the GCF of 655 and 660?

We will first find the prime factorization of 655 and 660. After we will calculate the factors of 655 and 660 and find the biggest common factor number .

Step-1: Prime Factorization of 655

Prime factors of 655 are 5, 131. Prime factorization of 655 in exponential form is:

655 = 5¹ × 131¹

Step-2: Prime Factorization of 660

Prime factors of 660 are 2, 3, 5, 11. Prime factorization of 660 in exponential form is:

660 = 2² × 3¹ × 5¹ × 11¹

Step-3: Factors of 655

List of positive integer factors of 655 that divides 655 without a remainder.

1, 5, 131

Step-4: Factors of 660

List of positive integer factors of 660 that divides 655 without a remainder.

1, 2, 3, 4, 5, 6, 10, 11, 12, 15, 20, 22, 30, 33, 44, 55, 60, 66, 110, 132, 165, 220, 330

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 655 and 660. The biggest common factor number is the GCF number.
So the greatest common factor 655 and 660 is 5.

Also check out the Least Common Multiple of 655 and 660