Greatest Common Factor of 645, 265, 21

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

• Greatest Common Factor of 645, 265, 21 by common division method
• Greatest Common Factor of 645, 265, 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 645

List of positive integer factors of 645 that divides 645 without a remainder.

1,3,5,15,43,129,215,645

Factors of 265

List of positive integer factors of 265 that divides 265 without a remainder.

1,5,53,265

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 645,265,21 . The biggest common factor number is the GCF number.
So the greatest common factor 645,265,21 is 1.

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

• GCF of 746, 231, 19
• GCF of 359, 682, 90
• GCF of 470, 611, 84
• GCF of 905, 829, 99
• GCF of 748, 672, 94

1. What is the GCF of 645, 265, 21?

Answer: GCF of 645, 265, 21 is 1.

2. How to Find the GCF of 645, 265, 21

Answer: Greatest Common Factor(GCF) of 645, 265, 21 = 1

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

Step 2: Then multiply all the prime factors GCF(645, 265, 21) = 1.