Greatest Common Factor of 20, 65, 138

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

• Greatest Common Factor of 20, 65, 138 by common division method
• Greatest Common Factor of 20, 65, 138 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 20

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

1,2,4,5,10,20

Factors of 65

List of positive integer factors of 65 that divides 65 without a remainder.

1,5,13,65

Factors of 138

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

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

Greatest Common Factor

We found the factors 20,65,138 . The biggest common factor number is the GCF number.
So the greatest common factor 20,65,138 is 1.

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

• GCF of 51, 85, 783
• GCF of 34, 23, 701
• GCF of 30, 80, 768
• GCF of 15, 75, 325
• GCF of 47, 63, 389

1. What is the GCF of 20, 65, 138?

Answer: GCF of 20, 65, 138 is 1.

2. How to Find the GCF of 20, 65, 138

Answer: Greatest Common Factor(GCF) of 20, 65, 138 = 1

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

Step 2: Then multiply all the prime factors GCF(20, 65, 138) = 1.