Greatest Common Factor of 15, 21, 16, 90, 51

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

• Greatest Common Factor of 15, 21, 16, 90, 51 by common division method
• Greatest Common Factor of 15, 21, 16, 90, 51 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 15

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

1,3,5,15

Factors of 21

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

1,3,7,21

Factors of 16

List of positive integer factors of 16 that divides 16 without a remainder.

1,2,4,8,16

Factors of 90

List of positive integer factors of 90 that divides 90 without a remainder.

1,2,3,5,6,9,10,15,18,30,45,90

Factors of 51

List of positive integer factors of 51 that divides 51 without a remainder.

1,3,17,51

Greatest Common Factor

We found the factors 15,21,16,90,51 . The biggest common factor number is the GCF number.
So the greatest common factor 15,21,16,90,51 is 1.

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

• GCF of 34, 98, 25, 85, 42
• GCF of 83, 56, 95, 99, 38
• GCF of 66, 35, 35, 68, 77
• GCF of 21, 21, 63, 35, 78
• GCF of 63, 24, 24, 36, 89

1. What is the GCF of 15, 21, 16, 90, 51?

Answer: GCF of 15, 21, 16, 90, 51 is 1.

2. How to Find the GCF of 15, 21, 16, 90, 51

Answer: Greatest Common Factor(GCF) of 15, 21, 16, 90, 51 = 1

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

Step 2: Then multiply all the prime factors GCF(15, 21, 16, 90, 51) = 1.