Greatest Common Factor of 42, 39, 90, 69, 644

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

• Greatest Common Factor of 42, 39, 90, 69, 644 by common division method
• Greatest Common Factor of 42, 39, 90, 69, 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 39

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

1,3,13,39

Factors of 90

List of positive integer factors of 90 that divides 90 without a remainder.

1,2,3,5,6,9,10,15,18,30,45,90

Factors of 69

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

1,3,23,69

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 42,39,90,69,644 . The biggest common factor number is the GCF number.
So the greatest common factor 42,39,90,69,644 is 1.

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

• GCF of 42, 54, 86, 70, 348
• GCF of 94, 60, 86, 19, 103
• GCF of 56, 83, 64, 78, 398
• GCF of 17, 93, 54, 87, 235
• GCF of 95, 63, 95, 15, 672

1. What is the GCF of 42, 39, 90, 69, 644?

Answer: GCF of 42, 39, 90, 69, 644 is 1.

2. How to Find the GCF of 42, 39, 90, 69, 644

Answer: Greatest Common Factor(GCF) of 42, 39, 90, 69, 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, 39, 90, 69, 644) = 1.