Greatest Common Factor of 171, 108, 21

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

• Greatest Common Factor of 171, 108, 21 by common division method
• Greatest Common Factor of 171, 108, 21 with matching the biggest common factor

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

Factors of 171

List of positive integer factors of 171 that divides 171 without a remainder.

1,3,9,19,57,171

Factors of 108

List of positive integer factors of 108 that divides 108 without a remainder.

1,2,3,4,6,9,12,18,27,36,54,108

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 171,108,21 . The biggest common factor number is the GCF number.
So the greatest common factor 171,108,21 is 3.

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

• GCF of 782, 744, 20
• GCF of 928, 696, 87
• GCF of 952, 756, 46
• GCF of 658, 749, 58
• GCF of 469, 230, 90

1. What is the GCF of 171, 108, 21?

Answer: GCF of 171, 108, 21 is 3.

2. How to Find the GCF of 171, 108, 21

Answer: Greatest Common Factor(GCF) of 171, 108, 21 = 3

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

Step 2: Then multiply all the prime factors GCF(171, 108, 21) = 3.