Greatest Common Factor of 28, 81, 19, 65

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

• Greatest Common Factor of 28, 81, 19, 65 by common division method
• Greatest Common Factor of 28, 81, 19, 65 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 81

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

1,3,9,27,81

Factors of 19

List of positive integer factors of 19 that divides 19 without a remainder.

1,19

Factors of 65

List of positive integer factors of 65 that divides 65 without a remainder.

1,5,13,65

Greatest Common Factor

We found the factors 28,81,19,65 . The biggest common factor number is the GCF number.
So the greatest common factor 28,81,19,65 is 1.

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

• GCF of 62, 25, 29, 82
• GCF of 20, 10, 75, 76
• GCF of 80, 39, 62, 68
• GCF of 59, 17, 58, 80
• GCF of 52, 35, 90, 82

1. What is the GCF of 28, 81, 19, 65?

Answer: GCF of 28, 81, 19, 65 is 1.

2. How to Find the GCF of 28, 81, 19, 65

Answer: Greatest Common Factor(GCF) of 28, 81, 19, 65 = 1

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

Step 2: Then multiply all the prime factors GCF(28, 81, 19, 65) = 1.