What is the Greatest Common Factor of 990 and 995?

Greatest common factor (GCF) of 990 and 995 is 5.

GCF(990,995) = 5

We will now calculate the prime factors of 990 and 995, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 990 and 995.

How to find the GCF of 990 and 995?

We will first find the prime factorization of 990 and 995. After we will calculate the factors of 990 and 995 and find the biggest common factor number .

Step-1: Prime Factorization of 990

Prime factors of 990 are 2, 3, 5, 11. Prime factorization of 990 in exponential form is:

990 = 2¹ × 3² × 5¹ × 11¹

Step-2: Prime Factorization of 995

Prime factors of 995 are 5, 199. Prime factorization of 995 in exponential form is:

995 = 5¹ × 199¹

Step-3: Factors of 990

List of positive integer factors of 990 that divides 990 without a remainder.

1, 2, 3, 5, 6, 9, 10, 11, 15, 18, 22, 30, 33, 45, 55, 66, 90, 99, 110, 165, 198, 330, 495

Step-4: Factors of 995

List of positive integer factors of 995 that divides 990 without a remainder.

1, 5, 199

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 990 and 995. The biggest common factor number is the GCF number.
So the greatest common factor 990 and 995 is 5.

Also check out the Least Common Multiple of 990 and 995