Greatest Common Factor of 21, 80, 638, 494

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

• Greatest Common Factor of 21, 80, 638, 494 by common division method
• Greatest Common Factor of 21, 80, 638, 494 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 21

List of positive integer factors of 21 that divides 21 without a remainder.

1,3,7,21

Factors of 80

List of positive integer factors of 80 that divides 80 without a remainder.

1,2,4,5,8,10,16,20,40,80

Factors of 638

List of positive integer factors of 638 that divides 638 without a remainder.

1,2,11,22,29,58,319,638

Factors of 494

List of positive integer factors of 494 that divides 494 without a remainder.

1,2,13,19,26,38,247,494

Greatest Common Factor

We found the factors 21,80,638,494 . The biggest common factor number is the GCF number.
So the greatest common factor 21,80,638,494 is 1.

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

• GCF of 67, 59, 421, 557
• GCF of 16, 28, 991, 769
• GCF of 31, 86, 349, 307
• GCF of 24, 87, 136, 591
• GCF of 13, 38, 364, 250

1. What is the GCF of 21, 80, 638, 494?

Answer: GCF of 21, 80, 638, 494 is 1.

2. How to Find the GCF of 21, 80, 638, 494

Answer: Greatest Common Factor(GCF) of 21, 80, 638, 494 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 80, 638, 494) = 1.