Greatest Common Factor of 20, 81, 72, 45

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

• Greatest Common Factor of 20, 81, 72, 45 by common division method
• Greatest Common Factor of 20, 81, 72, 45 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 20

List of positive integer factors of 20 that divides 20 without a remainder.

1,2,4,5,10,20

Factors of 81

List of positive integer factors of 81 that divides 81 without a remainder.

1,3,9,27,81

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 45

List of positive integer factors of 45 that divides 45 without a remainder.

1,3,5,9,15,45

Greatest Common Factor

We found the factors 20,81,72,45 . The biggest common factor number is the GCF number.
So the greatest common factor 20,81,72,45 is 1.

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

• GCF of 67, 96, 19, 16
• GCF of 93, 64, 48, 58
• GCF of 36, 37, 48, 68
• GCF of 26, 82, 59, 66
• GCF of 65, 62, 93, 56

1. What is the GCF of 20, 81, 72, 45?

Answer: GCF of 20, 81, 72, 45 is 1.

2. How to Find the GCF of 20, 81, 72, 45

Answer: Greatest Common Factor(GCF) of 20, 81, 72, 45 = 1

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

Step 2: Then multiply all the prime factors GCF(20, 81, 72, 45) = 1.