Greatest Common Factor of 11, 13, 21, 15

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

• Greatest Common Factor of 11, 13, 21, 15 by common division method
• Greatest Common Factor of 11, 13, 21, 15 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 11

List of positive integer factors of 11 that divides 11 without a remainder.

1,11

Factors of 13

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

1,13

Factors of 21

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

1,3,7,21

Factors of 15

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

1,3,5,15

Greatest Common Factor

We found the factors 11,13,21,15 . The biggest common factor number is the GCF number.
So the greatest common factor 11,13,21,15 is 1.

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

• GCF of 88, 43, 59, 33
• GCF of 51, 71, 37, 33
• GCF of 32, 78, 92, 36
• GCF of 77, 52, 43, 15
• GCF of 68, 40, 39, 89

1. What is the GCF of 11, 13, 21, 15?

Answer: GCF of 11, 13, 21, 15 is 1.

2. How to Find the GCF of 11, 13, 21, 15

Answer: Greatest Common Factor(GCF) of 11, 13, 21, 15 = 1

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

Step 2: Then multiply all the prime factors GCF(11, 13, 21, 15) = 1.