Greatest Common Factor of 21, 82, 17, 13, 390

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

• Greatest Common Factor of 21, 82, 17, 13, 390 by common division method
• Greatest Common Factor of 21, 82, 17, 13, 390 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 21

List of positive integer factors of 21 that divides 21 without a remainder.

1,3,7,21

Factors of 82

List of positive integer factors of 82 that divides 82 without a remainder.

1,2,41,82

Factors of 17

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

1,17

Factors of 13

List of positive integer factors of 13 that divides 13 without a remainder.

1,13

Factors of 390

List of positive integer factors of 390 that divides 390 without a remainder.

1,2,3,5,6,10,13,15,26,30,39,65,78,130,195,390

Greatest Common Factor

We found the factors 21,82,17,13,390 . The biggest common factor number is the GCF number.
So the greatest common factor 21,82,17,13,390 is 1.

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

• GCF of 10, 41, 80, 87, 955
• GCF of 15, 64, 63, 47, 441
• GCF of 17, 77, 71, 68, 779
• GCF of 24, 12, 42, 35, 803
• GCF of 30, 22, 25, 44, 842

1. What is the GCF of 21, 82, 17, 13, 390?

Answer: GCF of 21, 82, 17, 13, 390 is 1.

2. How to Find the GCF of 21, 82, 17, 13, 390

Answer: Greatest Common Factor(GCF) of 21, 82, 17, 13, 390 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 82, 17, 13, 390) = 1.