Greatest Common Factor of 28, 21, 81, 120

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

• Greatest Common Factor of 28, 21, 81, 120 by common division method
• Greatest Common Factor of 28, 21, 81, 120 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 28

List of positive integer factors of 28 that divides 28 without a remainder.

1,2,4,7,14,28

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 120

List of positive integer factors of 120 that divides 120 without a remainder.

1,2,3,4,5,6,8,10,12,15,20,24,30,40,60,120

Greatest Common Factor

We found the factors 28,21,81,120 . The biggest common factor number is the GCF number.
So the greatest common factor 28,21,81,120 is 1.

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

• GCF of 80, 76, 59, 238
• GCF of 61, 63, 35, 166
• GCF of 69, 77, 88, 611
• GCF of 41, 53, 92, 916
• GCF of 31, 55, 81, 149

1. What is the GCF of 28, 21, 81, 120?

Answer: GCF of 28, 21, 81, 120 is 1.

2. How to Find the GCF of 28, 21, 81, 120

Answer: Greatest Common Factor(GCF) of 28, 21, 81, 120 = 1

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

Step 2: Then multiply all the prime factors GCF(28, 21, 81, 120) = 1.