Greatest Common Factor of 21, 55, 813

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

• Greatest Common Factor of 21, 55, 813 by common division method
• Greatest Common Factor of 21, 55, 813 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 55

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

1,5,11,55

Factors of 813

List of positive integer factors of 813 that divides 813 without a remainder.

1,3,271,813

Greatest Common Factor

We found the factors 21,55,813 . The biggest common factor number is the GCF number.
So the greatest common factor 21,55,813 is 1.

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

• GCF of 10, 24, 621
• GCF of 18, 14, 284
• GCF of 87, 55, 943
• GCF of 83, 29, 311
• GCF of 73, 47, 670

1. What is the GCF of 21, 55, 813?

Answer: GCF of 21, 55, 813 is 1.

2. How to Find the GCF of 21, 55, 813

Answer: Greatest Common Factor(GCF) of 21, 55, 813 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 55, 813) = 1.