What is the Greatest Common Factor of 7715 and 7720?

Greatest common factor (GCF) of 7715 and 7720 is 5.

GCF(7715,7720) = 5

We will now calculate the prime factors of 7715 and 7720, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 7715 and 7720.

How to find the GCF of 7715 and 7720?

We will first find the prime factorization of 7715 and 7720. After we will calculate the factors of 7715 and 7720 and find the biggest common factor number .

Step-1: Prime Factorization of 7715

Prime factors of 7715 are 5, 1543. Prime factorization of 7715 in exponential form is:

7715 = 5¹ × 1543¹

Step-2: Prime Factorization of 7720

Prime factors of 7720 are 2, 5, 193. Prime factorization of 7720 in exponential form is:

7720 = 2³ × 5¹ × 193¹

Step-3: Factors of 7715

List of positive integer factors of 7715 that divides 7715 without a remainder.

1, 5, 1543

Step-4: Factors of 7720

List of positive integer factors of 7720 that divides 7715 without a remainder.

1, 2, 4, 5, 8, 10, 20, 40, 193, 386, 772, 965, 1544, 1930, 3860

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 7715 and 7720. The biggest common factor number is the GCF number.
So the greatest common factor 7715 and 7720 is 5.

Also check out the Least Common Multiple of 7715 and 7720