Greatest Common Factor of 28, 21, 86, 405

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

• Greatest Common Factor of 28, 21, 86, 405 by common division method
• Greatest Common Factor of 28, 21, 86, 405 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 28

List of positive integer factors of 28 that divides 28 without a remainder.

1,2,4,7,14,28

Factors of 21

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

1,3,7,21

Factors of 86

List of positive integer factors of 86 that divides 86 without a remainder.

1,2,43,86

Factors of 405

List of positive integer factors of 405 that divides 405 without a remainder.

1,3,5,9,15,27,45,81,135,405

Greatest Common Factor

We found the factors 28,21,86,405 . The biggest common factor number is the GCF number.
So the greatest common factor 28,21,86,405 is 1.

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

• GCF of 22, 71, 71, 643
• GCF of 20, 17, 77, 897
• GCF of 43, 64, 98, 698
• GCF of 58, 30, 65, 307
• GCF of 33, 27, 24, 707

1. What is the GCF of 28, 21, 86, 405?

Answer: GCF of 28, 21, 86, 405 is 1.

2. How to Find the GCF of 28, 21, 86, 405

Answer: Greatest Common Factor(GCF) of 28, 21, 86, 405 = 1

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

Step 2: Then multiply all the prime factors GCF(28, 21, 86, 405) = 1.