Greatest Common Factor of 21, 82, 63, 91

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

• Greatest Common Factor of 21, 82, 63, 91 by common division method
• Greatest Common Factor of 21, 82, 63, 91 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 82

List of positive integer factors of 82 that divides 82 without a remainder.

1,2,41,82

Factors of 63

List of positive integer factors of 63 that divides 63 without a remainder.

1,3,7,9,21,63

Factors of 91

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

1,7,13,91

Greatest Common Factor

We found the factors 21,82,63,91 . The biggest common factor number is the GCF number.
So the greatest common factor 21,82,63,91 is 1.

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

• GCF of 53, 75, 44, 18
• GCF of 65, 96, 70, 81
• GCF of 63, 16, 22, 79
• GCF of 70, 80, 98, 80
• GCF of 83, 50, 24, 88

1. What is the GCF of 21, 82, 63, 91?

Answer: GCF of 21, 82, 63, 91 is 1.

2. How to Find the GCF of 21, 82, 63, 91

Answer: Greatest Common Factor(GCF) of 21, 82, 63, 91 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 82, 63, 91) = 1.