Greatest Common Factor of 21, 646

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

• Greatest Common Factor of 21, 646 by common division method
• Greatest Common Factor of 21, 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 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 21,646 . The biggest common factor number is the GCF number.
So the greatest common factor 21,646 is 1.

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

• GCF of 48, 411
• GCF of 70, 408
• GCF of 81, 511
• GCF of 15, 723
• GCF of 70, 846

1. What is the GCF of 21, 646?

Answer: GCF of 21, 646 is 1.

2. How to Find the GCF of 21, 646

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