Greatest Common Factor of 72, 18, 42, 15

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

• Greatest Common Factor of 72, 18, 42, 15 by common division method
• Greatest Common Factor of 72, 18, 42, 15 with matching the biggest common factor

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∴ So the GCF of the given numbers is 3 = 3

Factors of 72

List of positive integer factors of 72 that divides 72 without a remainder.

1,2,3,4,6,8,9,12,18,24,36,72

Factors of 18

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

1,2,3,6,9,18

Factors of 42

List of positive integer factors of 42 that divides 42 without a remainder.

1,2,3,6,7,14,21,42

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 72,18,42,15 . The biggest common factor number is the GCF number.
So the greatest common factor 72,18,42,15 is 3.

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

• GCF of 91, 70, 61, 35
• GCF of 98, 68, 65, 73
• GCF of 76, 56, 12, 71
• GCF of 80, 77, 65, 37
• GCF of 28, 20, 81, 17

1. What is the GCF of 72, 18, 42, 15?

Answer: GCF of 72, 18, 42, 15 is 3.

2. How to Find the GCF of 72, 18, 42, 15

Answer: Greatest Common Factor(GCF) of 72, 18, 42, 15 = 3

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

Step 2: Then multiply all the prime factors GCF(72, 18, 42, 15) = 3.