What is the Greatest Common Factor of 1956 and 1965?

Greatest common factor (GCF) of 1956 and 1965 is 3.

GCF(1956,1965) = 3

We will now calculate the prime factors of 1956 and 1965, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1956 and 1965.

How to find the GCF of 1956 and 1965?

We will first find the prime factorization of 1956 and 1965. After we will calculate the factors of 1956 and 1965 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 1965

Prime factors of 1965 are 3, 5, 131. Prime factorization of 1965 in exponential form is:

1965 = 3¹ × 5¹ × 131¹

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 1965

List of positive integer factors of 1965 that divides 1956 without a remainder.

1, 3, 5, 15, 131, 393, 655

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1956 and 1965. The biggest common factor number is the GCF number.
So the greatest common factor 1956 and 1965 is 3.

Also check out the Least Common Multiple of 1956 and 1965