Greatest Common Factor of 643, 873, 21

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

• Greatest Common Factor of 643, 873, 21 by common division method
• Greatest Common Factor of 643, 873, 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 643

List of positive integer factors of 643 that divides 643 without a remainder.

1,643

Factors of 873

List of positive integer factors of 873 that divides 873 without a remainder.

1,3,9,97,291,873

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 643,873,21 . The biggest common factor number is the GCF number.
So the greatest common factor 643,873,21 is 1.

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

• GCF of 667, 622, 35
• GCF of 315, 456, 46
• GCF of 348, 233, 32
• GCF of 344, 652, 20
• GCF of 812, 704, 65

1. What is the GCF of 643, 873, 21?

Answer: GCF of 643, 873, 21 is 1.

2. How to Find the GCF of 643, 873, 21

Answer: Greatest Common Factor(GCF) of 643, 873, 21 = 1

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

Step 2: Then multiply all the prime factors GCF(643, 873, 21) = 1.