What is the Greatest Common Factor of 1958 and 1978?

Greatest common factor (GCF) of 1958 and 1978 is 2.

GCF(1958,1978) = 2

We will now calculate the prime factors of 1958 and 1978, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1958 and 1978.

How to find the GCF of 1958 and 1978?

We will first find the prime factorization of 1958 and 1978. After we will calculate the factors of 1958 and 1978 and find the biggest common factor number .

Step-1: Prime Factorization of 1958

Prime factors of 1958 are 2, 11, 89. Prime factorization of 1958 in exponential form is:

1958 = 2¹ × 11¹ × 89¹

Step-2: Prime Factorization of 1978

Prime factors of 1978 are 2, 23, 43. Prime factorization of 1978 in exponential form is:

1978 = 2¹ × 23¹ × 43¹

Step-3: Factors of 1958

List of positive integer factors of 1958 that divides 1958 without a remainder.

1, 2, 11, 22, 89, 178, 979

Step-4: Factors of 1978

List of positive integer factors of 1978 that divides 1958 without a remainder.

1, 2, 23, 43, 46, 86, 989

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1958 and 1978. The biggest common factor number is the GCF number.
So the greatest common factor 1958 and 1978 is 2.

Also check out the Least Common Multiple of 1958 and 1978