Greatest Common Factor of 56, 30, 51, 21

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

• Greatest Common Factor of 56, 30, 51, 21 by common division method
• Greatest Common Factor of 56, 30, 51, 21 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 56

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

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

Factors of 30

List of positive integer factors of 30 that divides 30 without a remainder.

1,2,3,5,6,10,15,30

Factors of 51

List of positive integer factors of 51 that divides 51 without a remainder.

1,3,17,51

Factors of 21

List of positive integer factors of 21 that divides 21 without a remainder.

1,3,7,21

Greatest Common Factor

We found the factors 56,30,51,21 . The biggest common factor number is the GCF number.
So the greatest common factor 56,30,51,21 is 1.

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

• GCF of 17, 53, 27, 97
• GCF of 34, 97, 61, 57
• GCF of 59, 20, 13, 58
• GCF of 19, 31, 95, 15
• GCF of 20, 62, 16, 67

1. What is the GCF of 56, 30, 51, 21?

Answer: GCF of 56, 30, 51, 21 is 1.

2. How to Find the GCF of 56, 30, 51, 21

Answer: Greatest Common Factor(GCF) of 56, 30, 51, 21 = 1

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

Step 2: Then multiply all the prime factors GCF(56, 30, 51, 21) = 1.