Greatest Common Factor of 21, 66, 87, 870

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

• Greatest Common Factor of 21, 66, 87, 870 by common division method
• Greatest Common Factor of 21, 66, 87, 870 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 66

List of positive integer factors of 66 that divides 66 without a remainder.

1,2,3,6,11,22,33,66

Factors of 87

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

1,3,29,87

Factors of 870

List of positive integer factors of 870 that divides 870 without a remainder.

1,2,3,5,6,10,15,29,30,58,87,145,174,290,435,870

Greatest Common Factor

We found the factors 21,66,87,870 . The biggest common factor number is the GCF number.
So the greatest common factor 21,66,87,870 is 3.

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

• GCF of 13, 44, 49, 186
• GCF of 78, 97, 71, 486
• GCF of 17, 89, 41, 131
• GCF of 84, 55, 81, 678
• GCF of 57, 10, 83, 601

1. What is the GCF of 21, 66, 87, 870?

Answer: GCF of 21, 66, 87, 870 is 3.

2. How to Find the GCF of 21, 66, 87, 870

Answer: Greatest Common Factor(GCF) of 21, 66, 87, 870 = 3

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

Step 2: Then multiply all the prime factors GCF(21, 66, 87, 870) = 3.