What is the Greatest Common Factor of 1956 and 1971?

Greatest common factor (GCF) of 1956 and 1971 is 3.

GCF(1956,1971) = 3

We will now calculate the prime factors of 1956 and 1971, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1956 and 1971.

How to find the GCF of 1956 and 1971?

We will first find the prime factorization of 1956 and 1971. After we will calculate the factors of 1956 and 1971 and find the biggest common factor number .

Step-1: Prime Factorization of 1956

Prime factors of 1956 are 2, 3, 163. Prime factorization of 1956 in exponential form is:

1956 = 2² × 3¹ × 163¹

Step-2: Prime Factorization of 1971

Prime factors of 1971 are 3, 73. Prime factorization of 1971 in exponential form is:

1971 = 3³ × 73¹

Step-3: Factors of 1956

List of positive integer factors of 1956 that divides 1956 without a remainder.

1, 2, 3, 4, 6, 12, 163, 326, 489, 652, 978

Step-4: Factors of 1971

List of positive integer factors of 1971 that divides 1956 without a remainder.

1, 3, 9, 27, 73, 219, 657

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1956 and 1971. The biggest common factor number is the GCF number.
So the greatest common factor 1956 and 1971 is 3.

Also check out the Least Common Multiple of 1956 and 1971