Greatest Common Factor of 21, 2, 15, 56

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

• Greatest Common Factor of 21, 2, 15, 56 by common division method
• Greatest Common Factor of 21, 2, 15, 56 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 2

List of positive integer factors of 2 that divides 2 without a remainder.

1,2

Factors of 15

List of positive integer factors of 15 that divides 15 without a remainder.

1,3,5,15

Factors of 56

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

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

Greatest Common Factor

We found the factors 21,2,15,56 . The biggest common factor number is the GCF number.
So the greatest common factor 21,2,15,56 is 1.

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

• GCF of 27, 6, 62, 65
• GCF of 74, 7, 52, 69
• GCF of 89, 4, 64, 20
• GCF of 58, 8, 44, 79
• GCF of 18, 6, 70, 77

1. What is the GCF of 21, 2, 15, 56?

Answer: GCF of 21, 2, 15, 56 is 1.

2. How to Find the GCF of 21, 2, 15, 56

Answer: Greatest Common Factor(GCF) of 21, 2, 15, 56 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 2, 15, 56) = 1.