Greatest Common Factor of 15, 18, 621

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

• Greatest Common Factor of 15, 18, 621 by common division method
• Greatest Common Factor of 15, 18, 621 with matching the biggest common factor

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∴ So the GCF of the given numbers is 3 = 3

Factors of 15

List of positive integer factors of 15 that divides 15 without a remainder.

1,3,5,15

Factors of 18

List of positive integer factors of 18 that divides 18 without a remainder.

1,2,3,6,9,18

Factors of 621

List of positive integer factors of 621 that divides 621 without a remainder.

1,3,9,23,27,69,207,621

Greatest Common Factor

We found the factors 15,18,621 . The biggest common factor number is the GCF number.
So the greatest common factor 15,18,621 is 3.

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

• GCF of 61, 44, 135
• GCF of 31, 80, 886
• GCF of 12, 80, 690
• GCF of 75, 20, 734
• GCF of 77, 76, 351

1. What is the GCF of 15, 18, 621?

Answer: GCF of 15, 18, 621 is 3.

2. How to Find the GCF of 15, 18, 621

Answer: Greatest Common Factor(GCF) of 15, 18, 621 = 3

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

Step 2: Then multiply all the prime factors GCF(15, 18, 621) = 3.