Greatest Common Factor of 28, 91, 15, 660

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

• Greatest Common Factor of 28, 91, 15, 660 by common division method
• Greatest Common Factor of 28, 91, 15, 660 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 28

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

1,2,4,7,14,28

Factors of 91

List of positive integer factors of 91 that divides 91 without a remainder.

1,7,13,91

Factors of 15

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

1,3,5,15

Factors of 660

List of positive integer factors of 660 that divides 660 without a remainder.

1,2,3,4,5,6,10,11,12,15,20,22,30,33,44,55,60,66,110,132,165,220,330,660

Greatest Common Factor

We found the factors 28,91,15,660 . The biggest common factor number is the GCF number.
So the greatest common factor 28,91,15,660 is 1.

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

• GCF of 42, 61, 62, 380
• GCF of 73, 52, 25, 102
• GCF of 75, 20, 68, 194
• GCF of 29, 77, 11, 969
• GCF of 93, 50, 45, 979

1. What is the GCF of 28, 91, 15, 660?

Answer: GCF of 28, 91, 15, 660 is 1.

2. How to Find the GCF of 28, 91, 15, 660

Answer: Greatest Common Factor(GCF) of 28, 91, 15, 660 = 1

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

Step 2: Then multiply all the prime factors GCF(28, 91, 15, 660) = 1.