Greatest Common Factor of 21, 65, 13, 670

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

• Greatest Common Factor of 21, 65, 13, 670 by common division method
• Greatest Common Factor of 21, 65, 13, 670 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 13

List of positive integer factors of 13 that divides 13 without a remainder.

1,13

Factors of 670

List of positive integer factors of 670 that divides 670 without a remainder.

1,2,5,10,67,134,335,670

Greatest Common Factor

We found the factors 21,65,13,670 . The biggest common factor number is the GCF number.
So the greatest common factor 21,65,13,670 is 1.

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

• GCF of 51, 77, 14, 145
• GCF of 64, 79, 52, 833
• GCF of 84, 56, 98, 279
• GCF of 95, 25, 78, 666
• GCF of 89, 76, 82, 639

1. What is the GCF of 21, 65, 13, 670?

Answer: GCF of 21, 65, 13, 670 is 1.

2. How to Find the GCF of 21, 65, 13, 670

Answer: Greatest Common Factor(GCF) of 21, 65, 13, 670 = 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, 13, 670) = 1.