Greatest Common Factor of 138, 455, 20

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

• Greatest Common Factor of 138, 455, 20 by common division method
• Greatest Common Factor of 138, 455, 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 455

List of positive integer factors of 455 that divides 455 without a remainder.

1,5,7,13,35,65,91,455

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 138,455,20 . The biggest common factor number is the GCF number.
So the greatest common factor 138,455,20 is 1.

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

• GCF of 355, 587, 44
• GCF of 525, 297, 33
• GCF of 659, 120, 57
• GCF of 573, 914, 28
• GCF of 652, 360, 41

1. What is the GCF of 138, 455, 20?

Answer: GCF of 138, 455, 20 is 1.

2. How to Find the GCF of 138, 455, 20

Answer: Greatest Common Factor(GCF) of 138, 455, 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, 455, 20) = 1.