GCF of 65 and 91


The gcf of 65 and 91 is the largest positive integer that divides the numbers 65 and 91 without a remainder. Spelled out, it is the greatest common factor of 65 and 91. Here you can find the gcf of 65 and 91, along with a total of three methods for computing it. In addition, we have a calculator you should check out. Not only can it determine the gcf of 65 and 91, but also that of three or more integers including sixty-five and ninety-one for example. Keep reading to learn everything about the gcf (65,91) and the terms related to it.

What is the GCF of 65 and 91

If you just want to know what is the greatest common factor of 65 and 91, it is 13. Usually, this is written as

gcf(65,91) = 13

The gcf of 65 and 91 can be obtained like this:

  • The factors of 65 are 65, 13, 5, 1.
  • The factors of 91 are 91, 13, 7, 1.
  • The common factors of 65 and 91 are 13, 1, intersecting the two sets above.
  • In the intersection factors of 65 ∩ factors of 91 the greatest element is 13.
  • Therefore, the greatest common factor of 65 and 91 is 13.

Taking the above into account you also know how to find all the common factors of 65 and 91, not just the greatest. In the next section we show you how to calculate the gcf of sixty-five and ninety-one by means of two more methods.

How to find the GCF of 65 and 91

The greatest common factor of 65 and 91 can be computed by using the least common multiple aka lcm of 65 and 91. This is the easiest approach:

gcf (65,91) = $\frac{65 \times 91}{lcm(65,91)} = \frac{5915}{455}$ = 13

Alternatively, the gcf of 65 and 91 can be found using the prime factorization of 65 and 91:

  • The prime factorization of 65 is: 5 x 13
  • The prime factorization of 91 is: 7 x 13
  • The prime factors and multiplicities 65 and 91 have in common are: 13
  • 13 is the gcf of 65 and 91
  • gcf(65,91) = 13

In any case, the easiest way to compute the gcf of two numbers like 65 and 91 is by using our calculator below. Note that it can also compute the gcf of more than two numbers, separated by a comma. For example, enter 65,91. The calculation is conducted automatically.

The gcf is...
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Use of GCF of 65 and 91

What is the greatest common factor of 65 and 91 used for? Answer: It is helpful for reducing fractions like 65 / 91. Just divide the nominator as well as the denominator by the gcf (65,91) to reduce the fraction to lowest terms.

$\frac{65}{91} = \frac{\frac{65}{13}}{\frac{91}{13}} = \frac{5}{7}$.

Properties of GCF of 65 and 91

The most important properties of the gcf(65,91) are:

  • Commutative property: gcf(65,91) = gcf(91,65)
  • Associative property: gcf(65,91,n) = gcf(gcf(91,65),n) $\hspace{10px}n\hspace{3px}\epsilon\hspace{3px}\mathbb{Z}$

The associativity is particularly useful to get the gcf of three or more numbers; our calculator makes use of it.

To sum up, the gcf of 65 and 91 is 13. In common notation: gcf (65,91) = 13.

If you have been searching for gcf 65 and 91 or gcf 65 91 then you have come to the correct page, too. The same is the true if you typed gcf for 65 and 91 in your favorite search engine.

Note that you can find the greatest common factor of many integer pairs including sixty-five / ninety-one by using the search form in the sidebar of this page.

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