Greatest Common Factor of 79, 89, 81, 9, 21

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

• Greatest Common Factor of 79, 89, 81, 9, 21 by common division method
• Greatest Common Factor of 79, 89, 81, 9, 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 79

List of positive integer factors of 79 that divides 79 without a remainder.

1,79

Factors of 89

List of positive integer factors of 89 that divides 89 without a remainder.

1,89

Factors of 81

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

1,3,9,27,81

Factors of 9

List of positive integer factors of 9 that divides 9 without a remainder.

1,3,9

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 79,89,81,9,21 . The biggest common factor number is the GCF number.
So the greatest common factor 79,89,81,9,21 is 1.

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

• GCF of 57, 41, 15, 5, 52
• GCF of 63, 99, 77, 3, 59
• GCF of 81, 60, 31, 3, 80
• GCF of 26, 12, 39, 4, 27
• GCF of 51, 96, 77, 5, 14

1. What is the GCF of 79, 89, 81, 9, 21?

Answer: GCF of 79, 89, 81, 9, 21 is 1.

2. How to Find the GCF of 79, 89, 81, 9, 21

Answer: Greatest Common Factor(GCF) of 79, 89, 81, 9, 21 = 1

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

Step 2: Then multiply all the prime factors GCF(79, 89, 81, 9, 21) = 1.