Greatest Common Factor of 642, 672, 21

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

• Greatest Common Factor of 642, 672, 21 by common division method
• Greatest Common Factor of 642, 672, 21 with matching the biggest common factor

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

Factors of 642

List of positive integer factors of 642 that divides 642 without a remainder.

1,2,3,6,107,214,321,642

Factors of 672

List of positive integer factors of 672 that divides 672 without a remainder.

1,2,3,4,6,7,8,12,14,16,21,24,28,32,42,48,56,84,96,112,168,224,336,672

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 642,672,21 . The biggest common factor number is the GCF number.
So the greatest common factor 642,672,21 is 3.

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

• GCF of 336, 106, 37
• GCF of 993, 111, 30
• GCF of 186, 370, 90
• GCF of 234, 568, 55
• GCF of 315, 824, 61

1. What is the GCF of 642, 672, 21?

Answer: GCF of 642, 672, 21 is 3.

2. How to Find the GCF of 642, 672, 21

Answer: Greatest Common Factor(GCF) of 642, 672, 21 = 3

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

Step 2: Then multiply all the prime factors GCF(642, 672, 21) = 3.