Greatest Common Factor of 21, 20, 83, 65

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

• Greatest Common Factor of 21, 20, 83, 65 by common division method
• Greatest Common Factor of 21, 20, 83, 65 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 20

List of positive integer factors of 20 that divides 20 without a remainder.

1,2,4,5,10,20

Factors of 83

List of positive integer factors of 83 that divides 83 without a remainder.

1,83

Factors of 65

List of positive integer factors of 65 that divides 65 without a remainder.

1,5,13,65

Greatest Common Factor

We found the factors 21,20,83,65 . The biggest common factor number is the GCF number.
So the greatest common factor 21,20,83,65 is 1.

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

• GCF of 22, 39, 29, 52
• GCF of 64, 29, 42, 20
• GCF of 17, 49, 67, 27
• GCF of 41, 25, 83, 79
• GCF of 62, 10, 31, 52

1. What is the GCF of 21, 20, 83, 65?

Answer: GCF of 21, 20, 83, 65 is 1.

2. How to Find the GCF of 21, 20, 83, 65

Answer: Greatest Common Factor(GCF) of 21, 20, 83, 65 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 20, 83, 65) = 1.