Greatest Common Factor of 21, 780, 390

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

• Greatest Common Factor of 21, 780, 390 by common division method
• Greatest Common Factor of 21, 780, 390 with matching the biggest common factor

Maximum 4 Number can be enter but you can reset

∴ So the GCF of the given numbers is 3 = 3

Factors of 21

List of positive integer factors of 21 that divides 21 without a remainder.

1,3,7,21

Factors of 780

List of positive integer factors of 780 that divides 780 without a remainder.

1,2,3,4,5,6,10,12,13,15,20,26,30,39,52,60,65,78,130,156,195,260,390,780

Factors of 390

List of positive integer factors of 390 that divides 390 without a remainder.

1,2,3,5,6,10,13,15,26,30,39,65,78,130,195,390

Greatest Common Factor

We found the factors 21,780,390 . The biggest common factor number is the GCF number.
So the greatest common factor 21,780,390 is 3.

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

• GCF of 38, 844, 978
• GCF of 71, 330, 960
• GCF of 74, 212, 712
• GCF of 29, 372, 306
• GCF of 69, 563, 989

1. What is the GCF of 21, 780, 390?

Answer: GCF of 21, 780, 390 is 3.

2. How to Find the GCF of 21, 780, 390

Answer: Greatest Common Factor(GCF) of 21, 780, 390 = 3

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

Step 2: Then multiply all the prime factors GCF(21, 780, 390) = 3.