Greatest Common Factor of 137, 257, 21

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

• Greatest Common Factor of 137, 257, 21 by common division method
• Greatest Common Factor of 137, 257, 21 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 137

List of positive integer factors of 137 that divides 137 without a remainder.

1,137

Factors of 257

List of positive integer factors of 257 that divides 257 without a remainder.

1,257

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 137,257,21 . The biggest common factor number is the GCF number.
So the greatest common factor 137,257,21 is 1.

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

• GCF of 217, 663, 85
• GCF of 180, 768, 14
• GCF of 177, 915, 24
• GCF of 205, 217, 36
• GCF of 902, 822, 21

1. What is the GCF of 137, 257, 21?

Answer: GCF of 137, 257, 21 is 1.

2. How to Find the GCF of 137, 257, 21

Answer: Greatest Common Factor(GCF) of 137, 257, 21 = 1

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

Step 2: Then multiply all the prime factors GCF(137, 257, 21) = 1.