Greatest Common Factor of 42, 13, 15, 561

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

• Greatest Common Factor of 42, 13, 15, 561 by common division method
• Greatest Common Factor of 42, 13, 15, 561 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 42

List of positive integer factors of 42 that divides 42 without a remainder.

1,2,3,6,7,14,21,42

Factors of 13

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

1,13

Factors of 15

List of positive integer factors of 15 that divides 15 without a remainder.

1,3,5,15

Factors of 561

List of positive integer factors of 561 that divides 561 without a remainder.

1,3,11,17,33,51,187,561

Greatest Common Factor

We found the factors 42,13,15,561 . The biggest common factor number is the GCF number.
So the greatest common factor 42,13,15,561 is 1.

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

• GCF of 68, 39, 61, 775
• GCF of 53, 24, 27, 843
• GCF of 38, 97, 68, 358
• GCF of 14, 19, 49, 421
• GCF of 90, 63, 11, 480

1. What is the GCF of 42, 13, 15, 561?

Answer: GCF of 42, 13, 15, 561 is 1.

2. How to Find the GCF of 42, 13, 15, 561

Answer: Greatest Common Factor(GCF) of 42, 13, 15, 561 = 1

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

Step 2: Then multiply all the prime factors GCF(42, 13, 15, 561) = 1.