Greatest Common Factor of 81, 21, 72, 491

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

• Greatest Common Factor of 81, 21, 72, 491 by common division method
• Greatest Common Factor of 81, 21, 72, 491 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 81

List of positive integer factors of 81 that divides 81 without a remainder.

1,3,9,27,81

Factors of 21

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

1,3,7,21

Factors of 72

List of positive integer factors of 72 that divides 72 without a remainder.

1,2,3,4,6,8,9,12,18,24,36,72

Factors of 491

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

1,491

Greatest Common Factor

We found the factors 81,21,72,491 . The biggest common factor number is the GCF number.
So the greatest common factor 81,21,72,491 is 1.

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

• GCF of 36, 26, 20, 217
• GCF of 49, 36, 93, 324
• GCF of 47, 44, 89, 362
• GCF of 34, 49, 11, 313
• GCF of 83, 56, 67, 275

1. What is the GCF of 81, 21, 72, 491?

Answer: GCF of 81, 21, 72, 491 is 1.

2. How to Find the GCF of 81, 21, 72, 491

Answer: Greatest Common Factor(GCF) of 81, 21, 72, 491 = 1

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

Step 2: Then multiply all the prime factors GCF(81, 21, 72, 491) = 1.