Greatest Common Factor of 21, 51, 39, 87

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

• Greatest Common Factor of 21, 51, 39, 87 by common division method
• Greatest Common Factor of 21, 51, 39, 87 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 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 87

List of positive integer factors of 87 that divides 87 without a remainder.

1,3,29,87

Greatest Common Factor

We found the factors 21,51,39,87 . The biggest common factor number is the GCF number.
So the greatest common factor 21,51,39,87 is 3.

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

• GCF of 98, 44, 38, 30
• GCF of 10, 62, 77, 50
• GCF of 16, 19, 72, 39
• GCF of 64, 23, 15, 37
• GCF of 64, 33, 46, 61

1. What is the GCF of 21, 51, 39, 87?

Answer: GCF of 21, 51, 39, 87 is 3.

2. How to Find the GCF of 21, 51, 39, 87

Answer: Greatest Common Factor(GCF) of 21, 51, 39, 87 = 3

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

Step 2: Then multiply all the prime factors GCF(21, 51, 39, 87) = 3.