GCF for 30 and 815

What is the Greatest Common Factor of 30 and 815?

Answer: GCF of 30 and 815 is 5

(Five)

Finding GCF for 30 and 815 using all factors (divisors) listing

The first method to find GCF for numbers 30 and 815 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 815: 1, 5, 163, 815

So the Greatest Common Factor for 30 and 815 is 5

Finding GCF for 30 and 815 by Prime Factorization

The second method to find GCF for numbers 30 and 815 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 815: 5, 163

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 815

GCF Table

Number 1Number 2GCF
158155
168151
178151
188151
198151
208155
218151
228151
238151
248151
258155
268151
278151
288151
298151
308155
318151
328151
338151
348151
358155
368151
378151
388151
398151
408155
418151
428151
438151
448151

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 815? (The answer is: 5). Select the first number (e.g. '30') and the second number (e.g. '815'). 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 815?

GCF of 30 and 815 is 5