Greatest Common Factor of 21, 65, 40, 231

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

• Greatest Common Factor of 21, 65, 40, 231 by common division method
• Greatest Common Factor of 21, 65, 40, 231 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 65

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

1,5,13,65

Factors of 40

List of positive integer factors of 40 that divides 40 without a remainder.

1,2,4,5,8,10,20,40

Factors of 231

List of positive integer factors of 231 that divides 231 without a remainder.

1,3,7,11,21,33,77,231

Greatest Common Factor

We found the factors 21,65,40,231 . The biggest common factor number is the GCF number.
So the greatest common factor 21,65,40,231 is 1.

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

• GCF of 34, 51, 48, 861
• GCF of 41, 23, 91, 370
• GCF of 77, 19, 80, 285
• GCF of 89, 26, 15, 213
• GCF of 53, 83, 25, 477

1. What is the GCF of 21, 65, 40, 231?

Answer: GCF of 21, 65, 40, 231 is 1.

2. How to Find the GCF of 21, 65, 40, 231

Answer: Greatest Common Factor(GCF) of 21, 65, 40, 231 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 65, 40, 231) = 1.