Greatest Common Factor of 51, 21, 77, 780

Greatest common factor or Greatest common divisor (GCD) can be calculated in two ways

• Greatest Common Factor of 51, 21, 77, 780 by common division method
• Greatest Common Factor of 51, 21, 77, 780 with matching the biggest common factor

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∴ GCF of numbers is 1 because of no common factors present between them.

Factors of 51

List of positive integer factors of 51 that divides 51 without a remainder.

1,3,17,51

Factors of 21

List of positive integer factors of 21 that divides 21 without a remainder.

1,3,7,21

Factors of 77

List of positive integer factors of 77 that divides 77 without a remainder.

1,7,11,77

Factors of 780

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

1,2,3,4,5,6,10,12,13,15,20,26,30,39,52,60,65,78,130,156,195,260,390,780

Greatest Common Factor

We found the factors 51,21,77,780 . The biggest common factor number is the GCF number.
So the greatest common factor 51,21,77,780 is 1.

Here are some samples of GCF of two or more Numbers calculations.

• GCF of 76, 89, 61, 909
• GCF of 81, 98, 87, 574
• GCF of 81, 92, 70, 832
• GCF of 89, 57, 38, 102
• GCF of 70, 21, 54, 472

1. What is the GCF of 51, 21, 77, 780?

Answer: GCF of 51, 21, 77, 780 is 1.

2. How to Find the GCF of 51, 21, 77, 780

Answer: Greatest Common Factor(GCF) of 51, 21, 77, 780 = 1

Step 1: Divide all the numbers with common prime numbers having remainder zero.

Step 2: Then multiply all the prime factors GCF(51, 21, 77, 780) = 1.