Greatest Common Factor of 18, 21, 35, 55, 79

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

• Greatest Common Factor of 18, 21, 35, 55, 79 by common division method
• Greatest Common Factor of 18, 21, 35, 55, 79 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 18

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

1,2,3,6,9,18

Factors of 21

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

1,3,7,21

Factors of 35

List of positive integer factors of 35 that divides 35 without a remainder.

1,5,7,35

Factors of 55

List of positive integer factors of 55 that divides 55 without a remainder.

1,5,11,55

Factors of 79

List of positive integer factors of 79 that divides 79 without a remainder.

1,79

Greatest Common Factor

We found the factors 18,21,35,55,79 . The biggest common factor number is the GCF number.
So the greatest common factor 18,21,35,55,79 is 1.

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

• GCF of 74, 13, 81, 91, 71
• GCF of 91, 44, 73, 18, 30
• GCF of 54, 96, 96, 90, 51
• GCF of 47, 72, 15, 18, 68
• GCF of 22, 99, 97, 74, 10

1. What is the GCF of 18, 21, 35, 55, 79?

Answer: GCF of 18, 21, 35, 55, 79 is 1.

2. How to Find the GCF of 18, 21, 35, 55, 79

Answer: Greatest Common Factor(GCF) of 18, 21, 35, 55, 79 = 1

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

Step 2: Then multiply all the prime factors GCF(18, 21, 35, 55, 79) = 1.