Greatest Common Factor of 21, 78, 12, 809

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

• Greatest Common Factor of 21, 78, 12, 809 by common division method
• Greatest Common Factor of 21, 78, 12, 809 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 21

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

1,3,7,21

Factors of 78

List of positive integer factors of 78 that divides 78 without a remainder.

1,2,3,6,13,26,39,78

Factors of 12

List of positive integer factors of 12 that divides 12 without a remainder.

1,2,3,4,6,12

Factors of 809

List of positive integer factors of 809 that divides 809 without a remainder.

1,809

Greatest Common Factor

We found the factors 21,78,12,809 . The biggest common factor number is the GCF number.
So the greatest common factor 21,78,12,809 is 1.

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

• GCF of 80, 55, 52, 960
• GCF of 52, 46, 26, 309
• GCF of 66, 44, 21, 723
• GCF of 59, 77, 90, 538
• GCF of 87, 97, 58, 101

1. What is the GCF of 21, 78, 12, 809?

Answer: GCF of 21, 78, 12, 809 is 1.

2. How to Find the GCF of 21, 78, 12, 809

Answer: Greatest Common Factor(GCF) of 21, 78, 12, 809 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 78, 12, 809) = 1.