Greatest Common Factor of 405, 745, 21

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

• Greatest Common Factor of 405, 745, 21 by common division method
• Greatest Common Factor of 405, 745, 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 405

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

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

Factors of 745

List of positive integer factors of 745 that divides 745 without a remainder.

1,5,149,745

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 405,745,21 . The biggest common factor number is the GCF number.
So the greatest common factor 405,745,21 is 1.

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

• GCF of 496, 487, 66
• GCF of 127, 555, 86
• GCF of 659, 140, 84
• GCF of 617, 448, 72
• GCF of 191, 860, 12

1. What is the GCF of 405, 745, 21?

Answer: GCF of 405, 745, 21 is 1.

2. How to Find the GCF of 405, 745, 21

Answer: Greatest Common Factor(GCF) of 405, 745, 21 = 1

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

Step 2: Then multiply all the prime factors GCF(405, 745, 21) = 1.