Greatest Common Factor of 20, 30, 42, 640

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

• Greatest Common Factor of 20, 30, 42, 640 by common division method
• Greatest Common Factor of 20, 30, 42, 640 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 30

List of positive integer factors of 30 that divides 30 without a remainder.

1,2,3,5,6,10,15,30

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 640

List of positive integer factors of 640 that divides 640 without a remainder.

1,2,4,5,8,10,16,20,32,40,64,80,128,160,320,640

Greatest Common Factor

We found the factors 20,30,42,640 . The biggest common factor number is the GCF number.
So the greatest common factor 20,30,42,640 is 2.

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

• GCF of 93, 89, 91, 285
• GCF of 43, 10, 69, 281
• GCF of 94, 55, 71, 130
• GCF of 20, 97, 96, 250
• GCF of 90, 48, 12, 126

1. What is the GCF of 20, 30, 42, 640?

Answer: GCF of 20, 30, 42, 640 is 2.

2. How to Find the GCF of 20, 30, 42, 640

Answer: Greatest Common Factor(GCF) of 20, 30, 42, 640 = 2

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

Step 2: Then multiply all the prime factors GCF(20, 30, 42, 640) = 2.