GCF of 9 and 15 (Greatest Common Factor)

"Greatest Common Factor" Calculator

Greatest Common Factor of

and

What is the Greatest Common Divisor of 9 and 15?

Answer

GCF of 9 and 15 is 3

(Three)

Finding GCF for 9 and 15 using all factors (divisors) listing

The first method to find GCF for numbers 9 and 15 is to list all factors for both numbers and pick the highest common one:

All factors of 9: 1, 3, 9

All factors of 15: 1, 3, 5, 15

So the Greatest Common Factor for 9 and 15 is 3

Finding GCF for 9 and 15 by Prime Factorization

The second method to find GCF for numbers 9 and 15 is to list all Prime Factors for both numbers and multiply the common ones:

All Prime Factors of 9: 3, 3

All Prime Factors of 15: 3, 5

As we can see there is only one Prime Factor common to both numbers. It is 3

So 3 is the Greatest Common Factor of 9 and 15

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About "Greatest Common Factor" Calculator

This calculator will help you find the greatest common factor (GCF) of two numbers. For example, it can help you find out what is the Greatest Common Divisor of 9 and 15? (The answer is: 3). Select the first number (e.g. '9') and the second number (e.g. '15'). After that hit the 'Calculate' button.
Greatest Common Factor (GCF) also known as the Greatest Common Divisor (GCD) or Highest Common Factor (HCF) - it is the largest positive integer that divides each of the integers with zero remainder.

"Greatest Common Factor" Calculator

Greatest Common Factor of

and

GCF Table

Number 1Number 2GCF
933
941
951
963
971
981
9101
9111
9123
9131
9141
9153
9161
9171
9189
9191
9201
9213
9221
9231
9243
9251
9261
9279
9291
9303
9311
9321
9333
9341

FAQ

What is the Greatest Common Divisor of 9 and 15?

GCF of 9 and 15 is 3

How to find the GCF of 9 and 15?

You can find the GCF of 9 and 15 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 9 and 15 is 3.

See Also