Greatest Common Factor of 21, 18, 656

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

• Greatest Common Factor of 21, 18, 656 by common division method
• Greatest Common Factor of 21, 18, 656 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 18

List of positive integer factors of 18 that divides 18 without a remainder.

1,2,3,6,9,18

Factors of 656

List of positive integer factors of 656 that divides 656 without a remainder.

1,2,4,8,16,41,82,164,328,656

Greatest Common Factor

We found the factors 21,18,656 . The biggest common factor number is the GCF number.
So the greatest common factor 21,18,656 is 1.

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

• GCF of 99, 42, 603
• GCF of 84, 69, 847
• GCF of 13, 82, 558
• GCF of 78, 62, 797
• GCF of 72, 18, 705

1. What is the GCF of 21, 18, 656?

Answer: GCF of 21, 18, 656 is 1.

2. How to Find the GCF of 21, 18, 656

Answer: Greatest Common Factor(GCF) of 21, 18, 656 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 18, 656) = 1.