Greatest Common Factor of 21, 56, 639

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

• Greatest Common Factor of 21, 56, 639 by common division method
• Greatest Common Factor of 21, 56, 639 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 56

List of positive integer factors of 56 that divides 56 without a remainder.

1,2,4,7,8,14,28,56

Factors of 639

List of positive integer factors of 639 that divides 639 without a remainder.

1,3,9,71,213,639

Greatest Common Factor

We found the factors 21,56,639 . The biggest common factor number is the GCF number.
So the greatest common factor 21,56,639 is 1.

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

• GCF of 38, 95, 181
• GCF of 81, 38, 874
• GCF of 77, 63, 718
• GCF of 65, 36, 748
• GCF of 77, 75, 126

1. What is the GCF of 21, 56, 639?

Answer: GCF of 21, 56, 639 is 1.

2. How to Find the GCF of 21, 56, 639

Answer: Greatest Common Factor(GCF) of 21, 56, 639 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 56, 639) = 1.