Greatest Common Factor of 21, 43, 77, 405

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

• Greatest Common Factor of 21, 43, 77, 405 by common division method
• Greatest Common Factor of 21, 43, 77, 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 21

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

1,3,7,21

Factors of 43

List of positive integer factors of 43 that divides 43 without a remainder.

1,43

Factors of 77

List of positive integer factors of 77 that divides 77 without a remainder.

1,7,11,77

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 21,43,77,405 . The biggest common factor number is the GCF number.
So the greatest common factor 21,43,77,405 is 1.

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

• GCF of 94, 65, 22, 597
• GCF of 79, 88, 30, 352
• GCF of 17, 43, 89, 485
• GCF of 44, 85, 64, 661
• GCF of 60, 24, 58, 415

1. What is the GCF of 21, 43, 77, 405?

Answer: GCF of 21, 43, 77, 405 is 1.

2. How to Find the GCF of 21, 43, 77, 405

Answer: Greatest Common Factor(GCF) of 21, 43, 77, 405 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 43, 77, 405) = 1.