Greatest Common Factor of 21, 60, 309, 389

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

• Greatest Common Factor of 21, 60, 309, 389 by common division method
• Greatest Common Factor of 21, 60, 309, 389 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 60

List of positive integer factors of 60 that divides 60 without a remainder.

1,2,3,4,5,6,10,12,15,20,30,60

Factors of 309

List of positive integer factors of 309 that divides 309 without a remainder.

1,3,103,309

Factors of 389

List of positive integer factors of 389 that divides 389 without a remainder.

1,389

Greatest Common Factor

We found the factors 21,60,309,389 . The biggest common factor number is the GCF number.
So the greatest common factor 21,60,309,389 is 1.

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

• GCF of 66, 71, 687, 147
• GCF of 67, 14, 977, 717
• GCF of 76, 62, 844, 736
• GCF of 19, 88, 805, 100
• GCF of 64, 64, 881, 452

1. What is the GCF of 21, 60, 309, 389?

Answer: GCF of 21, 60, 309, 389 is 1.

2. How to Find the GCF of 21, 60, 309, 389

Answer: Greatest Common Factor(GCF) of 21, 60, 309, 389 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 60, 309, 389) = 1.