Greatest Common Factor of 21, 13, 69, 28, 77

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

• Greatest Common Factor of 21, 13, 69, 28, 77 by common division method
• Greatest Common Factor of 21, 13, 69, 28, 77 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 13

List of positive integer factors of 13 that divides 13 without a remainder.

1,13

Factors of 69

List of positive integer factors of 69 that divides 69 without a remainder.

1,3,23,69

Factors of 28

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

1,2,4,7,14,28

Factors of 77

List of positive integer factors of 77 that divides 77 without a remainder.

1,7,11,77

Greatest Common Factor

We found the factors 21,13,69,28,77 . The biggest common factor number is the GCF number.
So the greatest common factor 21,13,69,28,77 is 1.

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

• GCF of 92, 17, 18, 32, 70
• GCF of 75, 78, 32, 28, 52
• GCF of 25, 62, 97, 92, 18
• GCF of 41, 51, 45, 40, 22
• GCF of 82, 76, 24, 95, 62

1. What is the GCF of 21, 13, 69, 28, 77?

Answer: GCF of 21, 13, 69, 28, 77 is 1.

2. How to Find the GCF of 21, 13, 69, 28, 77

Answer: Greatest Common Factor(GCF) of 21, 13, 69, 28, 77 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 13, 69, 28, 77) = 1.