GCF for 80 and 640

What is the Greatest Common Factor of 80 and 640?

Answer: GCF of 80 and 640 is 80

(Eighty)

Finding GCF for 80 and 640 using all factors (divisors) listing

The first method to find GCF for numbers 80 and 640 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 640: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640

So the Greatest Common Factor for 80 and 640 is 80

Finding GCF for 80 and 640 by Prime Factorization

The second method to find GCF for numbers 80 and 640 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 640: 2, 2, 2, 2, 2, 2, 2, 5

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

Now we need to multiply them to find GCF: 2 × 2 × 2 × 2 × 5 = 80

GCF Table

Number 1Number 2GCF
656405
666402
676401
686404
696401
7064010
716401
726408
736401
746402
756405
766404
776401
786402
796401
8064080
816401
826402
836401
846404
856405
866402
876401
886408
896401
9064010
916401
926404
936401
946402

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 640? (The answer is: 80). Select the first number (e.g. '80') and the second number (e.g. '640'). 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 640?

GCF of 80 and 640 is 80