Greatest Common Factor of 18, 91, 21, 819

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

• Greatest Common Factor of 18, 91, 21, 819 by common division method
• Greatest Common Factor of 18, 91, 21, 819 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 91

List of positive integer factors of 91 that divides 91 without a remainder.

1,7,13,91

Factors of 21

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

1,3,7,21

Factors of 819

List of positive integer factors of 819 that divides 819 without a remainder.

1,3,7,9,13,21,39,63,91,117,273,819

Greatest Common Factor

We found the factors 18,91,21,819 . The biggest common factor number is the GCF number.
So the greatest common factor 18,91,21,819 is 1.

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

• GCF of 74, 48, 93, 789
• GCF of 66, 40, 91, 541
• GCF of 20, 49, 32, 460
• GCF of 23, 18, 15, 493
• GCF of 25, 89, 43, 562

1. What is the GCF of 18, 91, 21, 819?

Answer: GCF of 18, 91, 21, 819 is 1.

2. How to Find the GCF of 18, 91, 21, 819

Answer: Greatest Common Factor(GCF) of 18, 91, 21, 819 = 1

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

Step 2: Then multiply all the prime factors GCF(18, 91, 21, 819) = 1.