Greatest Common Factor of 90, 20, 42, 647

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

• Greatest Common Factor of 90, 20, 42, 647 by common division method
• Greatest Common Factor of 90, 20, 42, 647 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 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 20

List of positive integer factors of 20 that divides 20 without a remainder.

1,2,4,5,10,20

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 647

List of positive integer factors of 647 that divides 647 without a remainder.

1,647

Greatest Common Factor

We found the factors 90,20,42,647 . The biggest common factor number is the GCF number.
So the greatest common factor 90,20,42,647 is 1.

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

• GCF of 11, 65, 35, 144
• GCF of 41, 33, 57, 724
• GCF of 69, 64, 37, 295
• GCF of 15, 99, 53, 260
• GCF of 23, 14, 53, 678

1. What is the GCF of 90, 20, 42, 647?

Answer: GCF of 90, 20, 42, 647 is 1.

2. How to Find the GCF of 90, 20, 42, 647

Answer: Greatest Common Factor(GCF) of 90, 20, 42, 647 = 1

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

Step 2: Then multiply all the prime factors GCF(90, 20, 42, 647) = 1.