What is the Greatest Common Factor of 9981 and 9990?

Greatest common factor (GCF) of 9981 and 9990 is 9.

GCF(9981,9990) = 9

We will now calculate the prime factors of 9981 and 9990, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 9981 and 9990.

How to find the GCF of 9981 and 9990?

We will first find the prime factorization of 9981 and 9990. After we will calculate the factors of 9981 and 9990 and find the biggest common factor number .

Step-1: Prime Factorization of 9981

Prime factors of 9981 are 3, 1109. Prime factorization of 9981 in exponential form is:

9981 = 3² × 1109¹

Step-2: Prime Factorization of 9990

Prime factors of 9990 are 2, 3, 5, 37. Prime factorization of 9990 in exponential form is:

9990 = 2¹ × 3³ × 5¹ × 37¹

Step-3: Factors of 9981

List of positive integer factors of 9981 that divides 9981 without a remainder.

1, 3, 9, 1109, 3327

Step-4: Factors of 9990

List of positive integer factors of 9990 that divides 9981 without a remainder.

1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 37, 45, 54, 74, 90, 111, 135, 185, 222, 270, 333, 370, 555, 666, 999, 1110, 1665, 1998, 3330, 4995

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 9981 and 9990. The biggest common factor number is the GCF number.
So the greatest common factor 9981 and 9990 is 9.

Also check out the Least Common Multiple of 9981 and 9990