What is the Greatest Common Factor of 9980 and 9985?

Greatest common factor (GCF) of 9980 and 9985 is 5.

GCF(9980,9985) = 5

We will now calculate the prime factors of 9980 and 9985, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 9980 and 9985.

How to find the GCF of 9980 and 9985?

We will first find the prime factorization of 9980 and 9985. After we will calculate the factors of 9980 and 9985 and find the biggest common factor number .

Step-1: Prime Factorization of 9980

Prime factors of 9980 are 2, 5, 499. Prime factorization of 9980 in exponential form is:

9980 = 2² × 5¹ × 499¹

Step-2: Prime Factorization of 9985

Prime factors of 9985 are 5, 1997. Prime factorization of 9985 in exponential form is:

9985 = 5¹ × 1997¹

Step-3: Factors of 9980

List of positive integer factors of 9980 that divides 9980 without a remainder.

1, 2, 4, 5, 10, 20, 499, 998, 1996, 2495, 4990

Step-4: Factors of 9985

List of positive integer factors of 9985 that divides 9980 without a remainder.

1, 5, 1997

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 9980 and 9985. The biggest common factor number is the GCF number.
So the greatest common factor 9980 and 9985 is 5.

Also check out the Least Common Multiple of 9980 and 9985