GCF for 80 and 780

What is the Greatest Common Factor of 80 and 780?

Answer: GCF of 80 and 780 is 20

(Twenty)

Finding GCF for 80 and 780 using all factors (divisors) listing

The first method to find GCF for numbers 80 and 780 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 780: 1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 780

So the Greatest Common Factor for 80 and 780 is 20

Finding GCF for 80 and 780 by Prime Factorization

The second method to find GCF for numbers 80 and 780 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 780: 2, 2, 3, 5, 13

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
6578065
667806
677801
687804
697803
7078010
717801
7278012
737801
747802
7578015
767804
777801
7878078
797801
8078020
817803
827802
837801
8478012
857805
867802
877803
887804
897801
9078030
9178013
927804
937803
947802

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 780? (The answer is: 20). Select the first number (e.g. '80') and the second number (e.g. '780'). 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 780?

GCF of 80 and 780 is 20