Greatest Common Factor of 20, 80, 28, 642

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

• Greatest Common Factor of 20, 80, 28, 642 by common division method
• Greatest Common Factor of 20, 80, 28, 642 with matching the biggest common factor

Maximum 4 Number can be enter but you can reset

∴ So the GCF of the given numbers is 2 = 2

Factors of 20

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

1,2,4,5,10,20

Factors of 80

List of positive integer factors of 80 that divides 80 without a remainder.

1,2,4,5,8,10,16,20,40,80

Factors of 28

List of positive integer factors of 28 that divides 28 without a remainder.

1,2,4,7,14,28

Factors of 642

List of positive integer factors of 642 that divides 642 without a remainder.

1,2,3,6,107,214,321,642

Greatest Common Factor

We found the factors 20,80,28,642 . The biggest common factor number is the GCF number.
So the greatest common factor 20,80,28,642 is 2.

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

• GCF of 99, 98, 40, 236
• GCF of 70, 70, 25, 142
• GCF of 57, 36, 73, 280
• GCF of 51, 46, 79, 249
• GCF of 95, 49, 14, 436

1. What is the GCF of 20, 80, 28, 642?

Answer: GCF of 20, 80, 28, 642 is 2.

2. How to Find the GCF of 20, 80, 28, 642

Answer: Greatest Common Factor(GCF) of 20, 80, 28, 642 = 2

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

Step 2: Then multiply all the prime factors GCF(20, 80, 28, 642) = 2.