GCF for 70 and 810

What is the Greatest Common Factor of 70 and 810?

Answer: GCF of 70 and 810 is 10

(Ten)

Finding GCF for 70 and 810 using all factors (divisors) listing

The first method to find GCF for numbers 70 and 810 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 810: 1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 54, 81, 90, 135, 162, 270, 405, 810

So the Greatest Common Factor for 70 and 810 is 10

Finding GCF for 70 and 810 by Prime Factorization

The second method to find GCF for numbers 70 and 810 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 810: 2, 3, 3, 3, 3, 5

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
558105
568102
578103
588102
598101
6081030
618101
628102
638109
648102
658105
668106
678101
688102
698103
7081010
718101
7281018
738101
748102
7581015
768102
778101
788106
798101
8081010
8181081
828102
838101
848106

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 810? (The answer is: 10). Select the first number (e.g. '70') and the second number (e.g. '810'). 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 810?

GCF of 70 and 810 is 10