What is the Greatest Common Factor of 1975 and 1990?

Greatest common factor (GCF) of 1975 and 1990 is 5.

GCF(1975,1990) = 5

We will now calculate the prime factors of 1975 and 1990, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1975 and 1990.

How to find the GCF of 1975 and 1990?

We will first find the prime factorization of 1975 and 1990. After we will calculate the factors of 1975 and 1990 and find the biggest common factor number .

Step-1: Prime Factorization of 1975

Prime factors of 1975 are 5, 79. Prime factorization of 1975 in exponential form is:

1975 = 5² × 79¹

Step-2: 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-3: Factors of 1975

List of positive integer factors of 1975 that divides 1975 without a remainder.

1, 5, 25, 79, 395

Step-4: Factors of 1990

List of positive integer factors of 1990 that divides 1975 without a remainder.

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

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1975 and 1990. The biggest common factor number is the GCF number.
So the greatest common factor 1975 and 1990 is 5.

Also check out the Least Common Multiple of 1975 and 1990