Greatest Common Factor of 12, 30, 21, 105

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

• Greatest Common Factor of 12, 30, 21, 105 by common division method
• Greatest Common Factor of 12, 30, 21, 105 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 12

List of positive integer factors of 12 that divides 12 without a remainder.

1,2,3,4,6,12

Factors of 30

List of positive integer factors of 30 that divides 30 without a remainder.

1,2,3,5,6,10,15,30

Factors of 21

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

1,3,7,21

Factors of 105

List of positive integer factors of 105 that divides 105 without a remainder.

1,3,5,7,15,21,35,105

Greatest Common Factor

We found the factors 12,30,21,105 . The biggest common factor number is the GCF number.
So the greatest common factor 12,30,21,105 is 3.

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

• GCF of 29, 40, 55, 868
• GCF of 45, 72, 78, 902
• GCF of 31, 88, 44, 508
• GCF of 65, 31, 38, 672
• GCF of 89, 80, 47, 261

1. What is the GCF of 12, 30, 21, 105?

Answer: GCF of 12, 30, 21, 105 is 3.

2. How to Find the GCF of 12, 30, 21, 105

Answer: Greatest Common Factor(GCF) of 12, 30, 21, 105 = 3

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

Step 2: Then multiply all the prime factors GCF(12, 30, 21, 105) = 3.