What is the Greatest Common Factor of 770 and 780?

Greatest common factor (GCF) of 770 and 780 is 10.

GCF(770,780) = 10

We will now calculate the prime factors of 770 and 780, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 770 and 780.

How to find the GCF of 770 and 780?

We will first find the prime factorization of 770 and 780. After we will calculate the factors of 770 and 780 and find the biggest common factor number .

Step-1: Prime Factorization of 770

Prime factors of 770 are 2, 5, 7, 11. Prime factorization of 770 in exponential form is:

770 = 2¹ × 5¹ × 7¹ × 11¹

Step-2: Prime Factorization of 780

Prime factors of 780 are 2, 3, 5, 13. Prime factorization of 780 in exponential form is:

780 = 2² × 3¹ × 5¹ × 13¹

Step-3: Factors of 770

List of positive integer factors of 770 that divides 770 without a remainder.

1, 2, 5, 7, 10, 11, 14, 22, 35, 55, 70, 77, 110, 154, 385

Step-4: Factors of 780

List of positive integer factors of 780 that divides 770 without a remainder.

1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 770 and 780. The biggest common factor number is the GCF number.
So the greatest common factor 770 and 780 is 10.

Also check out the Least Common Multiple of 770 and 780