Greatest Common Factor of 18, 28, 78, 80

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

• Greatest Common Factor of 18, 28, 78, 80 by common division method
• Greatest Common Factor of 18, 28, 78, 80 with matching the biggest common factor

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∴ So the GCF of the given numbers is 2 = 2

Factors of 18

List of positive integer factors of 18 that divides 18 without a remainder.

1,2,3,6,9,18

Factors of 28

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

1,2,4,7,14,28

Factors of 78

List of positive integer factors of 78 that divides 78 without a remainder.

1,2,3,6,13,26,39,78

Factors of 80

List of positive integer factors of 80 that divides 80 without a remainder.

1,2,4,5,8,10,16,20,40,80

Greatest Common Factor

We found the factors 18,28,78,80 . The biggest common factor number is the GCF number.
So the greatest common factor 18,28,78,80 is 2.

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

• GCF of 34, 11, 14, 68
• GCF of 21, 12, 74, 23
• GCF of 17, 24, 91, 83
• GCF of 51, 11, 79, 71
• GCF of 93, 13, 59, 38

1. What is the GCF of 18, 28, 78, 80?

Answer: GCF of 18, 28, 78, 80 is 2.

2. How to Find the GCF of 18, 28, 78, 80

Answer: Greatest Common Factor(GCF) of 18, 28, 78, 80 = 2

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

Step 2: Then multiply all the prime factors GCF(18, 28, 78, 80) = 2.