Greatest Common Factor of 20, 90, 40, 561

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

• Greatest Common Factor of 20, 90, 40, 561 by common division method
• Greatest Common Factor of 20, 90, 40, 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 20

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

1,2,4,5,10,20

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 40

List of positive integer factors of 40 that divides 40 without a remainder.

1,2,4,5,8,10,20,40

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 20,90,40,561 . The biggest common factor number is the GCF number.
So the greatest common factor 20,90,40,561 is 1.

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

• GCF of 22, 74, 72, 842
• GCF of 17, 90, 91, 365
• GCF of 76, 21, 76, 531
• GCF of 65, 22, 26, 244
• GCF of 96, 67, 46, 207

1. What is the GCF of 20, 90, 40, 561?

Answer: GCF of 20, 90, 40, 561 is 1.

2. How to Find the GCF of 20, 90, 40, 561

Answer: Greatest Common Factor(GCF) of 20, 90, 40, 561 = 1

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

Step 2: Then multiply all the prime factors GCF(20, 90, 40, 561) = 1.