Greatest Common Factor of 28, 45, 78, 660

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

• Greatest Common Factor of 28, 45, 78, 660 by common division method
• Greatest Common Factor of 28, 45, 78, 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 45

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

1,3,5,9,15,45

Factors of 78

List of positive integer factors of 78 that divides 78 without a remainder.

1,2,3,6,13,26,39,78

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 28,45,78,660 . The biggest common factor number is the GCF number.
So the greatest common factor 28,45,78,660 is 1.

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

• GCF of 74, 70, 96, 156
• GCF of 74, 79, 96, 779
• GCF of 98, 15, 33, 709
• GCF of 54, 87, 93, 928
• GCF of 54, 55, 18, 950

1. What is the GCF of 28, 45, 78, 660?

Answer: GCF of 28, 45, 78, 660 is 1.

2. How to Find the GCF of 28, 45, 78, 660

Answer: Greatest Common Factor(GCF) of 28, 45, 78, 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, 45, 78, 660) = 1.