Greatest Common Factor of 21, 61, 69, 39

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

• Greatest Common Factor of 21, 61, 69, 39 by common division method
• Greatest Common Factor of 21, 61, 69, 39 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 61

List of positive integer factors of 61 that divides 61 without a remainder.

1,61

Factors of 69

List of positive integer factors of 69 that divides 69 without a remainder.

1,3,23,69

Factors of 39

List of positive integer factors of 39 that divides 39 without a remainder.

1,3,13,39

Greatest Common Factor

We found the factors 21,61,69,39 . The biggest common factor number is the GCF number.
So the greatest common factor 21,61,69,39 is 1.

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

• GCF of 70, 58, 38, 56
• GCF of 25, 57, 93, 15
• GCF of 30, 99, 69, 51
• GCF of 20, 26, 77, 71
• GCF of 97, 84, 24, 38

1. What is the GCF of 21, 61, 69, 39?

Answer: GCF of 21, 61, 69, 39 is 1.

2. How to Find the GCF of 21, 61, 69, 39

Answer: Greatest Common Factor(GCF) of 21, 61, 69, 39 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 61, 69, 39) = 1.