Greatest Common Factor of 21, 11, 56, 81

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

• Greatest Common Factor of 21, 11, 56, 81 by common division method
• Greatest Common Factor of 21, 11, 56, 81 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 11

List of positive integer factors of 11 that divides 11 without a remainder.

1,11

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 81

List of positive integer factors of 81 that divides 81 without a remainder.

1,3,9,27,81

Greatest Common Factor

We found the factors 21,11,56,81 . The biggest common factor number is the GCF number.
So the greatest common factor 21,11,56,81 is 1.

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

• GCF of 33, 32, 91, 67
• GCF of 17, 88, 21, 81
• GCF of 65, 83, 20, 22
• GCF of 87, 61, 62, 70
• GCF of 67, 54, 43, 10

1. What is the GCF of 21, 11, 56, 81?

Answer: GCF of 21, 11, 56, 81 is 1.

2. How to Find the GCF of 21, 11, 56, 81

Answer: Greatest Common Factor(GCF) of 21, 11, 56, 81 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 11, 56, 81) = 1.