Greatest Common Factor of 28, 91, 17, 34, 640

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

• Greatest Common Factor of 28, 91, 17, 34, 640 by common division method
• Greatest Common Factor of 28, 91, 17, 34, 640 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 17

List of positive integer factors of 17 that divides 17 without a remainder.

1,17

Factors of 34

List of positive integer factors of 34 that divides 34 without a remainder.

1,2,17,34

Factors of 640

List of positive integer factors of 640 that divides 640 without a remainder.

1,2,4,5,8,10,16,20,32,40,64,80,128,160,320,640

Greatest Common Factor

We found the factors 28,91,17,34,640 . The biggest common factor number is the GCF number.
So the greatest common factor 28,91,17,34,640 is 1.

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

• GCF of 54, 95, 99, 56, 228
• GCF of 88, 14, 44, 13, 496
• GCF of 96, 92, 32, 68, 808
• GCF of 87, 31, 36, 35, 203
• GCF of 35, 51, 97, 20, 810

1. What is the GCF of 28, 91, 17, 34, 640?

Answer: GCF of 28, 91, 17, 34, 640 is 1.

2. How to Find the GCF of 28, 91, 17, 34, 640

Answer: Greatest Common Factor(GCF) of 28, 91, 17, 34, 640 = 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, 17, 34, 640) = 1.