Greatest Common Factor of 21, 9, 66, 15

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

• Greatest Common Factor of 21, 9, 66, 15 by common division method
• Greatest Common Factor of 21, 9, 66, 15 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 9

List of positive integer factors of 9 that divides 9 without a remainder.

1,3,9

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 15

List of positive integer factors of 15 that divides 15 without a remainder.

1,3,5,15

Greatest Common Factor

We found the factors 21,9,66,15 . The biggest common factor number is the GCF number.
So the greatest common factor 21,9,66,15 is 3.

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

• GCF of 78, 2, 32, 43
• GCF of 89, 1, 57, 95
• GCF of 20, 3, 24, 54
• GCF of 99, 9, 41, 34
• GCF of 49, 6, 39, 56

1. What is the GCF of 21, 9, 66, 15?

Answer: GCF of 21, 9, 66, 15 is 3.

2. How to Find the GCF of 21, 9, 66, 15

Answer: Greatest Common Factor(GCF) of 21, 9, 66, 15 = 3

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

Step 2: Then multiply all the prime factors GCF(21, 9, 66, 15) = 3.