Greatest Common Factor of 28, 40, 39, 688

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

• Greatest Common Factor of 28, 40, 39, 688 by common division method
• Greatest Common Factor of 28, 40, 39, 688 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 40

List of positive integer factors of 40 that divides 40 without a remainder.

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

Factors of 39

List of positive integer factors of 39 that divides 39 without a remainder.

1,3,13,39

Factors of 688

List of positive integer factors of 688 that divides 688 without a remainder.

1,2,4,8,16,43,86,172,344,688

Greatest Common Factor

We found the factors 28,40,39,688 . The biggest common factor number is the GCF number.
So the greatest common factor 28,40,39,688 is 1.

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

• GCF of 69, 75, 47, 455
• GCF of 98, 17, 45, 698
• GCF of 83, 64, 34, 511
• GCF of 62, 31, 11, 990
• GCF of 86, 49, 63, 376

1. What is the GCF of 28, 40, 39, 688?

Answer: GCF of 28, 40, 39, 688 is 1.

2. How to Find the GCF of 28, 40, 39, 688

Answer: Greatest Common Factor(GCF) of 28, 40, 39, 688 = 1

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

Step 2: Then multiply all the prime factors GCF(28, 40, 39, 688) = 1.