Greatest Common Factor of 21, 69, 646

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

• Greatest Common Factor of 21, 69, 646 by common division method
• Greatest Common Factor of 21, 69, 646 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 69

List of positive integer factors of 69 that divides 69 without a remainder.

1,3,23,69

Factors of 646

List of positive integer factors of 646 that divides 646 without a remainder.

1,2,17,19,34,38,323,646

Greatest Common Factor

We found the factors 21,69,646 . The biggest common factor number is the GCF number.
So the greatest common factor 21,69,646 is 1.

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

• GCF of 90, 89, 476
• GCF of 29, 43, 515
• GCF of 40, 35, 700
• GCF of 20, 43, 575
• GCF of 67, 52, 462

1. What is the GCF of 21, 69, 646?

Answer: GCF of 21, 69, 646 is 1.

2. How to Find the GCF of 21, 69, 646

Answer: Greatest Common Factor(GCF) of 21, 69, 646 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 69, 646) = 1.