Greatest Common Factor of 51, 39, 21

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

• Greatest Common Factor of 51, 39, 21 by common division method
• Greatest Common Factor of 51, 39, 21 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 51

List of positive integer factors of 51 that divides 51 without a remainder.

1,3,17,51

Factors of 39

List of positive integer factors of 39 that divides 39 without a remainder.

1,3,13,39

Factors of 21

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

1,3,7,21

Greatest Common Factor

We found the factors 51,39,21 . The biggest common factor number is the GCF number.
So the greatest common factor 51,39,21 is 3.

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

• GCF of 54, 31, 73
• GCF of 27, 70, 55
• GCF of 28, 77, 18
• GCF of 61, 30, 96
• GCF of 46, 90, 57

1. What is the GCF of 51, 39, 21?

Answer: GCF of 51, 39, 21 is 3.

2. How to Find the GCF of 51, 39, 21

Answer: Greatest Common Factor(GCF) of 51, 39, 21 = 3

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

Step 2: Then multiply all the prime factors GCF(51, 39, 21) = 3.