Greatest Common Factor of 80, 81, 45, 28

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

• Greatest Common Factor of 80, 81, 45, 28 by common division method
• Greatest Common Factor of 80, 81, 45, 28 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 80

List of positive integer factors of 80 that divides 80 without a remainder.

1,2,4,5,8,10,16,20,40,80

Factors of 81

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

1,3,9,27,81

Factors of 45

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

1,3,5,9,15,45

Factors of 28

List of positive integer factors of 28 that divides 28 without a remainder.

1,2,4,7,14,28

Greatest Common Factor

We found the factors 80,81,45,28 . The biggest common factor number is the GCF number.
So the greatest common factor 80,81,45,28 is 1.

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

• GCF of 62, 29, 67, 47
• GCF of 87, 23, 96, 87
• GCF of 54, 70, 65, 63
• GCF of 33, 85, 91, 36
• GCF of 13, 70, 47, 27

1. What is the GCF of 80, 81, 45, 28?

Answer: GCF of 80, 81, 45, 28 is 1.

2. How to Find the GCF of 80, 81, 45, 28

Answer: Greatest Common Factor(GCF) of 80, 81, 45, 28 = 1

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

Step 2: Then multiply all the prime factors GCF(80, 81, 45, 28) = 1.