What is the Greatest Common Factor of 1990 and 2002?

Greatest common factor (GCF) of 1990 and 2002 is 2.

GCF(1990,2002) = 2

We will now calculate the prime factors of 1990 and 2002, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1990 and 2002.

How to find the GCF of 1990 and 2002?

We will first find the prime factorization of 1990 and 2002. After we will calculate the factors of 1990 and 2002 and find the biggest common factor number .

Step-1: Prime Factorization of 1990

Prime factors of 1990 are 2, 5, 199. Prime factorization of 1990 in exponential form is:

1990 = 2¹ × 5¹ × 199¹

Step-2: Prime Factorization of 2002

Prime factors of 2002 are 2, 7, 11, 13. Prime factorization of 2002 in exponential form is:

2002 = 2¹ × 7¹ × 11¹ × 13¹

Step-3: Factors of 1990

List of positive integer factors of 1990 that divides 1990 without a remainder.

1, 2, 5, 10, 199, 398, 995

Step-4: Factors of 2002

List of positive integer factors of 2002 that divides 1990 without a remainder.

1, 2, 7, 11, 13, 14, 22, 26, 77, 91, 143, 154, 182, 286, 1001

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1990 and 2002. The biggest common factor number is the GCF number.
So the greatest common factor 1990 and 2002 is 2.

Also check out the Least Common Multiple of 1990 and 2002