Greatest Common Factor of 42, 81, 79, 644

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

• Greatest Common Factor of 42, 81, 79, 644 by common division method
• Greatest Common Factor of 42, 81, 79, 644 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 81

List of positive integer factors of 81 that divides 81 without a remainder.

1,3,9,27,81

Factors of 79

List of positive integer factors of 79 that divides 79 without a remainder.

1,79

Factors of 644

List of positive integer factors of 644 that divides 644 without a remainder.

1,2,4,7,14,23,28,46,92,161,322,644

Greatest Common Factor

We found the factors 42,81,79,644 . The biggest common factor number is the GCF number.
So the greatest common factor 42,81,79,644 is 1.

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

• GCF of 38, 25, 42, 111
• GCF of 88, 27, 42, 263
• GCF of 13, 96, 14, 855
• GCF of 68, 60, 82, 481
• GCF of 79, 64, 60, 232

1. What is the GCF of 42, 81, 79, 644?

Answer: GCF of 42, 81, 79, 644 is 1.

2. How to Find the GCF of 42, 81, 79, 644

Answer: Greatest Common Factor(GCF) of 42, 81, 79, 644 = 1

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

Step 2: Then multiply all the prime factors GCF(42, 81, 79, 644) = 1.