Greatest Common Factor of 81, 97, 21, 399

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

• Greatest Common Factor of 81, 97, 21, 399 by common division method
• Greatest Common Factor of 81, 97, 21, 399 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 97

List of positive integer factors of 97 that divides 97 without a remainder.

1,97

Factors of 21

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

1,3,7,21

Factors of 399

List of positive integer factors of 399 that divides 399 without a remainder.

1,3,7,19,21,57,133,399

Greatest Common Factor

We found the factors 81,97,21,399 . The biggest common factor number is the GCF number.
So the greatest common factor 81,97,21,399 is 1.

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

• GCF of 99, 36, 10, 562
• GCF of 46, 42, 24, 349
• GCF of 96, 76, 94, 193
• GCF of 96, 97, 54, 271
• GCF of 42, 64, 60, 548

1. What is the GCF of 81, 97, 21, 399?

Answer: GCF of 81, 97, 21, 399 is 1.

2. How to Find the GCF of 81, 97, 21, 399

Answer: Greatest Common Factor(GCF) of 81, 97, 21, 399 = 1

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

Step 2: Then multiply all the prime factors GCF(81, 97, 21, 399) = 1.