Greatest Common Factor of 21, 81, 47, 720

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

• Greatest Common Factor of 21, 81, 47, 720 by common division method
• Greatest Common Factor of 21, 81, 47, 720 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 81

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

1,3,9,27,81

Factors of 47

List of positive integer factors of 47 that divides 47 without a remainder.

1,47

Factors of 720

List of positive integer factors of 720 that divides 720 without a remainder.

1,2,3,4,5,6,8,9,10,12,15,16,18,20,24,30,36,40,45,48,60,72,80,90,120,144,180,240,360,720

Greatest Common Factor

We found the factors 21,81,47,720 . The biggest common factor number is the GCF number.
So the greatest common factor 21,81,47,720 is 1.

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

• GCF of 56, 59, 28, 579
• GCF of 27, 71, 44, 769
• GCF of 46, 63, 96, 356
• GCF of 84, 44, 95, 332
• GCF of 97, 15, 90, 334

1. What is the GCF of 21, 81, 47, 720?

Answer: GCF of 21, 81, 47, 720 is 1.

2. How to Find the GCF of 21, 81, 47, 720

Answer: Greatest Common Factor(GCF) of 21, 81, 47, 720 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 81, 47, 720) = 1.