What is the Greatest Common Factor of 7740 and 7760?

Greatest common factor (GCF) of 7740 and 7760 is 20.

GCF(7740,7760) = 20

We will now calculate the prime factors of 7740 and 7760, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 7740 and 7760.

How to find the GCF of 7740 and 7760?

We will first find the prime factorization of 7740 and 7760. After we will calculate the factors of 7740 and 7760 and find the biggest common factor number .

Step-1: Prime Factorization of 7740

Prime factors of 7740 are 2, 3, 5, 43. Prime factorization of 7740 in exponential form is:

7740 = 2² × 3² × 5¹ × 43¹

Step-2: Prime Factorization of 7760

Prime factors of 7760 are 2, 5, 97. Prime factorization of 7760 in exponential form is:

7760 = 2⁴ × 5¹ × 97¹

Step-3: Factors of 7740

List of positive integer factors of 7740 that divides 7740 without a remainder.

1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 43, 45, 60, 86, 90, 129, 172, 180, 215, 258, 387, 430, 516, 645, 774, 860, 1290, 1548, 1935, 2580, 3870

Step-4: Factors of 7760

List of positive integer factors of 7760 that divides 7740 without a remainder.

1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 97, 194, 388, 485, 776, 970, 1552, 1940, 3880

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 7740 and 7760. The biggest common factor number is the GCF number.
So the greatest common factor 7740 and 7760 is 20.

Also check out the Least Common Multiple of 7740 and 7760