Greatest Common Factor of 78, 42, 20

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

• Greatest Common Factor of 78, 42, 20 by common division method
• Greatest Common Factor of 78, 42, 20 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 78

List of positive integer factors of 78 that divides 78 without a remainder.

1,2,3,6,13,26,39,78

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 20

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

1,2,4,5,10,20

Greatest Common Factor

We found the factors 78,42,20 . The biggest common factor number is the GCF number.
So the greatest common factor 78,42,20 is 2.

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

• GCF of 61, 58, 57
• GCF of 27, 32, 57
• GCF of 34, 23, 68
• GCF of 35, 56, 21
• GCF of 21, 74, 66

1. What is the GCF of 78, 42, 20?

Answer: GCF of 78, 42, 20 is 2.

2. How to Find the GCF of 78, 42, 20

Answer: Greatest Common Factor(GCF) of 78, 42, 20 = 2

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

Step 2: Then multiply all the prime factors GCF(78, 42, 20) = 2.