GCF for 70 and 780

What is the Greatest Common Factor of 70 and 780?

Answer: GCF of 70 and 780 is 10

(Ten)

Finding GCF for 70 and 780 using all factors (divisors) listing

The first method to find GCF for numbers 70 and 780 is to list all factors for both numbers and pick the highest common one:

All factors of 70: 1, 2, 5, 7, 10, 14, 35, 70

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 70 and 780 is 10

Finding GCF for 70 and 780 by Prime Factorization

The second method to find GCF for numbers 70 and 780 is to list all Prime Factors for both numbers and multiply the common ones:

All Prime Factors of 70: 2, 5, 7

All Prime Factors of 780: 2, 2, 3, 5, 13

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

Now we need to multiply them to find GCF: 2 × 5 = 10

GCF Table

Number 1Number 2GCF
557805
567804
577803
587802
597801
6078060
617801
627802
637803
647804
6578065
667806
677801
687804
697803
7078010
717801
7278012
737801
747802
7578015
767804
777801
7878078
797801
8078020
817803
827802
837801
8478012

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 70 and 780? (The answer is: 10). Select the first number (e.g. '70') 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 70 and 780?

GCF of 70 and 780 is 10