What is the Greatest Common Factor of 980 and 985?

Greatest common factor (GCF) of 980 and 985 is 5.

GCF(980,985) = 5

We will now calculate the prime factors of 980 and 985, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 980 and 985.

How to find the GCF of 980 and 985?

We will first find the prime factorization of 980 and 985. After we will calculate the factors of 980 and 985 and find the biggest common factor number .

Step-1: Prime Factorization of 980

Prime factors of 980 are 2, 5, 7. Prime factorization of 980 in exponential form is:

980 = 2² × 5¹ × 7²

Step-2: Prime Factorization of 985

Prime factors of 985 are 5, 197. Prime factorization of 985 in exponential form is:

985 = 5¹ × 197¹

Step-3: Factors of 980

List of positive integer factors of 980 that divides 980 without a remainder.

1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490

Step-4: Factors of 985

List of positive integer factors of 985 that divides 980 without a remainder.

1, 5, 197

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 980 and 985. The biggest common factor number is the GCF number.
So the greatest common factor 980 and 985 is 5.

Also check out the Least Common Multiple of 980 and 985