Greatest Common Factor of 138, 109, 20

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

• Greatest Common Factor of 138, 109, 20 by common division method
• Greatest Common Factor of 138, 109, 20 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 138

List of positive integer factors of 138 that divides 138 without a remainder.

1,2,3,6,23,46,69,138

Factors of 109

List of positive integer factors of 109 that divides 109 without a remainder.

1,109

Factors of 20

List of positive integer factors of 20 that divides 20 without a remainder.

1,2,4,5,10,20

Greatest Common Factor

We found the factors 138,109,20 . The biggest common factor number is the GCF number.
So the greatest common factor 138,109,20 is 1.

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

• GCF of 897, 430, 59
• GCF of 129, 822, 79
• GCF of 224, 535, 12
• GCF of 378, 210, 87
• GCF of 507, 397, 63

1. What is the GCF of 138, 109, 20?

Answer: GCF of 138, 109, 20 is 1.

2. How to Find the GCF of 138, 109, 20

Answer: Greatest Common Factor(GCF) of 138, 109, 20 = 1

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

Step 2: Then multiply all the prime factors GCF(138, 109, 20) = 1.