Greatest Common Factor of 18, 21, 12, 47

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

• Greatest Common Factor of 18, 21, 12, 47 by common division method
• Greatest Common Factor of 18, 21, 12, 47 with matching the biggest common factor

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∴ GCF of numbers is 1 because of no common factors present between them.

Factors of 18

List of positive integer factors of 18 that divides 18 without a remainder.

1,2,3,6,9,18

Factors of 21

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

1,3,7,21

Factors of 12

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

1,2,3,4,6,12

Factors of 47

List of positive integer factors of 47 that divides 47 without a remainder.

1,47

Greatest Common Factor

We found the factors 18,21,12,47 . The biggest common factor number is the GCF number.
So the greatest common factor 18,21,12,47 is 1.

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

• GCF of 36, 24, 74, 39
• GCF of 33, 43, 75, 38
• GCF of 58, 16, 82, 68
• GCF of 25, 50, 20, 47
• GCF of 64, 84, 32, 52

1. What is the GCF of 18, 21, 12, 47?

Answer: GCF of 18, 21, 12, 47 is 1.

2. How to Find the GCF of 18, 21, 12, 47

Answer: Greatest Common Factor(GCF) of 18, 21, 12, 47 = 1

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

Step 2: Then multiply all the prime factors GCF(18, 21, 12, 47) = 1.