What is the Greatest Common Factor of 660 and 670?

Greatest common factor (GCF) of 660 and 670 is 10.

GCF(660,670) = 10

We will now calculate the prime factors of 660 and 670, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 660 and 670.

How to find the GCF of 660 and 670?

We will first find the prime factorization of 660 and 670. After we will calculate the factors of 660 and 670 and find the biggest common factor number .

Step-1: 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-2: Prime Factorization of 670

Prime factors of 670 are 2, 5, 67. Prime factorization of 670 in exponential form is:

670 = 2¹ × 5¹ × 67¹

Step-3: Factors of 660

List of positive integer factors of 660 that divides 660 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

Step-4: Factors of 670

List of positive integer factors of 670 that divides 660 without a remainder.

1, 2, 5, 10, 67, 134, 335

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 660 and 670. The biggest common factor number is the GCF number.
So the greatest common factor 660 and 670 is 10.

Also check out the Least Common Multiple of 660 and 670