GCF for 80 and 660

What is the Greatest Common Factor of 80 and 660?

Answer: GCF of 80 and 660 is 20

(Twenty)

Finding GCF for 80 and 660 using all factors (divisors) listing

The first method to find GCF for numbers 80 and 660 is to list all factors for both numbers and pick the highest common one:

All factors of 80: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80

All factors of 660: 1, 2, 3, 4, 5, 6, 10, 11, 12, 15, 20, 22, 30, 33, 44, 55, 60, 66, 110, 132, 165, 220, 330, 660

So the Greatest Common Factor for 80 and 660 is 20

Finding GCF for 80 and 660 by Prime Factorization

The second method to find GCF for numbers 80 and 660 is to list all Prime Factors for both numbers and multiply the common ones:

All Prime Factors of 80: 2, 2, 2, 2, 5

All Prime Factors of 660: 2, 2, 3, 5, 11

As we can see there are Prime Factors common to both numbers: 2, 2, 5

Now we need to multiply them to find GCF: 2 × 2 × 5 = 20

GCF Table

Number 1Number 2GCF
656605
6666066
676601
686604
696603
7066010
716601
7266012
736601
746602
7566015
766604
7766011
786606
796601
8066020
816603
826602
836601
8466012
856605
866602
876603
8866044
896601
9066030
916601
926604
936603
946602

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 80 and 660? (The answer is: 20). Select the first number (e.g. '80') and the second number (e.g. '660'). 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 80 and 660?

GCF of 80 and 660 is 20