Greatest Common Factor of 28, 12, 21, 72

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

• Greatest Common Factor of 28, 12, 21, 72 by common division method
• Greatest Common Factor of 28, 12, 21, 72 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 12

List of positive integer factors of 12 that divides 12 without a remainder.

1,2,3,4,6,12

Factors of 21

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

1,3,7,21

Factors of 72

List of positive integer factors of 72 that divides 72 without a remainder.

1,2,3,4,6,8,9,12,18,24,36,72

Greatest Common Factor

We found the factors 28,12,21,72 . The biggest common factor number is the GCF number.
So the greatest common factor 28,12,21,72 is 1.

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

• GCF of 35, 67, 32, 19
• GCF of 54, 74, 48, 81
• GCF of 46, 17, 40, 73
• GCF of 43, 92, 61, 34
• GCF of 17, 96, 81, 57

1. What is the GCF of 28, 12, 21, 72?

Answer: GCF of 28, 12, 21, 72 is 1.

2. How to Find the GCF of 28, 12, 21, 72

Answer: Greatest Common Factor(GCF) of 28, 12, 21, 72 = 1

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

Step 2: Then multiply all the prime factors GCF(28, 12, 21, 72) = 1.