GCF of 18 and 57 (Greatest Common Factor)

"Greatest Common Factor" Calculator

Greatest Common Factor of

and

What is the Greatest Common Divisor of 18 and 57?

Answer

GCF of 18 and 57 is 3

(Three)

Finding GCF for 18 and 57 using all factors (divisors) listing

The first method to find GCF for numbers 18 and 57 is to list all factors for both numbers and pick the highest common one:

All factors of 18: 1, 2, 3, 6, 9, 18

All factors of 57: 1, 3, 19, 57

So the Greatest Common Factor for 18 and 57 is 3

Finding GCF for 18 and 57 by Prime Factorization

The second method to find GCF for numbers 18 and 57 is to list all Prime Factors for both numbers and multiply the common ones:

All Prime Factors of 18: 2, 3, 3

All Prime Factors of 57: 3, 19

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 18 and 57

Related Calculations

See Also

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 18 and 57? (The answer is: 3). Select the first number (e.g. '18') and the second number (e.g. '57'). 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
18279
18282
18291
18306
18311
18322
18333
18342
18351
183618
18371
18382
18393
18402
18426
18431
18459
18462
18471
18486
18491
18502
18513
185418
18551
18562
18573
18582
18591
18606

FAQ

What is the Greatest Common Divisor of 18 and 57?

GCF of 18 and 57 is 3

How to find the GCF of 18 and 57?

You can find the GCF of 18 and 57 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 18 and 57 is 3.

See Also