Greatest Common Factor of 645, 798, 21

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

• Greatest Common Factor of 645, 798, 21 by common division method
• Greatest Common Factor of 645, 798, 21 with matching the biggest common factor

Maximum 4 Number can be enter but you can reset

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

Factors of 645

List of positive integer factors of 645 that divides 645 without a remainder.

1,3,5,15,43,129,215,645

Factors of 798

List of positive integer factors of 798 that divides 798 without a remainder.

1,2,3,6,7,14,19,21,38,42,57,114,133,266,399,798

Factors of 21

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

1,3,7,21

Greatest Common Factor

We found the factors 645,798,21 . The biggest common factor number is the GCF number.
So the greatest common factor 645,798,21 is 3.

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

• GCF of 180, 539, 24
• GCF of 125, 882, 85
• GCF of 784, 616, 23
• GCF of 873, 314, 73
• GCF of 308, 950, 82

1. What is the GCF of 645, 798, 21?

Answer: GCF of 645, 798, 21 is 3.

2. How to Find the GCF of 645, 798, 21

Answer: Greatest Common Factor(GCF) of 645, 798, 21 = 3

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

Step 2: Then multiply all the prime factors GCF(645, 798, 21) = 3.