What is the Greatest Common Factor of 7940 and 7956?

Greatest common factor (GCF) of 7940 and 7956 is 4.

GCF(7940,7956) = 4

We will now calculate the prime factors of 7940 and 7956, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 7940 and 7956.

How to find the GCF of 7940 and 7956?

We will first find the prime factorization of 7940 and 7956. After we will calculate the factors of 7940 and 7956 and find the biggest common factor number .

Step-1: Prime Factorization of 7940

Prime factors of 7940 are 2, 5, 397. Prime factorization of 7940 in exponential form is:

7940 = 2² × 5¹ × 397¹

Step-2: Prime Factorization of 7956

Prime factors of 7956 are 2, 3, 13, 17. Prime factorization of 7956 in exponential form is:

7956 = 2² × 3² × 13¹ × 17¹

Step-3: Factors of 7940

List of positive integer factors of 7940 that divides 7940 without a remainder.

1, 2, 4, 5, 10, 20, 397, 794, 1588, 1985, 3970

Step-4: Factors of 7956

List of positive integer factors of 7956 that divides 7940 without a remainder.

1, 2, 3, 4, 6, 9, 12, 13, 17, 18, 26, 34, 36, 39, 51, 52, 68, 78, 102, 117, 153, 156, 204, 221, 234, 306, 442, 468, 612, 663, 884, 1326, 1989, 2652, 3978

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 7940 and 7956. The biggest common factor number is the GCF number.
So the greatest common factor 7940 and 7956 is 4.

Also check out the Least Common Multiple of 7940 and 7956