GCF for 30 and 685

What is the Greatest Common Factor of 30 and 685?

Answer: GCF of 30 and 685 is 5

(Five)

Finding GCF for 30 and 685 using all factors (divisors) listing

The first method to find GCF for numbers 30 and 685 is to list all factors for both numbers and pick the highest common one:

All factors of 30: 1, 2, 3, 5, 6, 10, 15, 30

All factors of 685: 1, 5, 137, 685

So the Greatest Common Factor for 30 and 685 is 5

Finding GCF for 30 and 685 by Prime Factorization

The second method to find GCF for numbers 30 and 685 is to list all Prime Factors for both numbers and multiply the common ones:

All Prime Factors of 30: 2, 3, 5

All Prime Factors of 685: 5, 137

As we can see there is only one Prime Factor common to both numbers. It is 5

So 5 is the Greatest Common Factor of 30 and 685

GCF Table

Number 1Number 2GCF
156855
166851
176851
186851
196851
206855
216851
226851
236851
246851
256855
266851
276851
286851
296851
306855
316851
326851
336851
346851
356855
366851
376851
386851
396851
406855
416851
426851
436851
446851

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 Factor of 30 and 685? (The answer is: 5). Select the first number (e.g. '30') and the second number (e.g. '685'). 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

FAQ

What is the Greatest Common Factor of 30 and 685?

GCF of 30 and 685 is 5