GCF of 4 and 18 (Greatest Common Factor)

"Greatest Common Factor" Calculator

Greatest Common Factor of

and

What is the Greatest Common Divisor of 4 and 18?

Answer

GCF of 4 and 18 is 2

(Two)

Finding GCF for 4 and 18 using all factors (divisors) listing

The first method to find GCF for numbers 4 and 18 is to list all factors for both numbers and pick the highest common one:

All factors of 4: 1, 2, 4

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

So the Greatest Common Factor for 4 and 18 is 2

Finding GCF for 4 and 18 by Prime Factorization

The second method to find GCF for numbers 4 and 18 is to list all Prime Factors for both numbers and multiply the common ones:

All Prime Factors of 4: 2, 2

All Prime Factors of 18: 2, 3, 3

As we can see there is only one Prime Factor common to both numbers. It is 2

So 2 is the Greatest Common Factor of 4 and 18

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 4 and 18? (The answer is: 2). Select the first number (e.g. '4') and the second number (e.g. '18'). 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
431
451
462
471
484
491
4102
4111
4124
4131
4142
4151
4164
4182
4204
4211
4222
4231
4244
4251
4262
4271
4284
4302
4324
4351
4364
4371
4382
4404

FAQ

What is the Greatest Common Divisor of 4 and 18?

GCF of 4 and 18 is 2

How to find the GCF of 4 and 18?

You can find the GCF of 4 and 18 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 4 and 18 is 2.

See Also