Greatest Common Factor of 491, 455, 21

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

• Greatest Common Factor of 491, 455, 21 by common division method
• Greatest Common Factor of 491, 455, 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 491

List of positive integer factors of 491 that divides 491 without a remainder.

1,491

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 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 491,455,21 . The biggest common factor number is the GCF number.
So the greatest common factor 491,455,21 is 1.

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

• GCF of 598, 653, 87
• GCF of 320, 122, 26
• GCF of 412, 702, 20
• GCF of 956, 708, 56
• GCF of 911, 242, 37

1. What is the GCF of 491, 455, 21?

Answer: GCF of 491, 455, 21 is 1.

2. How to Find the GCF of 491, 455, 21

Answer: Greatest Common Factor(GCF) of 491, 455, 21 = 1

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

Step 2: Then multiply all the prime factors GCF(491, 455, 21) = 1.