Greatest Common Factor of 21, 15, 18, 63

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

• Greatest Common Factor of 21, 15, 18, 63 by common division method
• Greatest Common Factor of 21, 15, 18, 63 with matching the biggest common factor

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∴ 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 15

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

1,3,5,15

Factors of 18

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

1,2,3,6,9,18

Factors of 63

List of positive integer factors of 63 that divides 63 without a remainder.

1,3,7,9,21,63

Greatest Common Factor

We found the factors 21,15,18,63 . The biggest common factor number is the GCF number.
So the greatest common factor 21,15,18,63 is 3.

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

• GCF of 47, 12, 27, 61
• GCF of 17, 50, 35, 32
• GCF of 98, 75, 97, 71
• GCF of 85, 56, 46, 64
• GCF of 54, 79, 64, 95

1. What is the GCF of 21, 15, 18, 63?

Answer: GCF of 21, 15, 18, 63 is 3.

2. How to Find the GCF of 21, 15, 18, 63

Answer: Greatest Common Factor(GCF) of 21, 15, 18, 63 = 3

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

Step 2: Then multiply all the prime factors GCF(21, 15, 18, 63) = 3.