The **gcf of 63 and 81** is the largest positive integer that divides the numbers 63 and 81 without a remainder. Spelled out, it is the greatest common factor of 63 and 81. Here you can find the gcf of 63 and 81, 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 63 and 81, but also that of three or more integers including sixty-three and eighty-one for example. Keep reading to learn everything about the gcf (63,81) and the terms related to it.

## What is the GCF of 63 and 81

If you just want to know *what is the greatest common factor of 63 and 81*, it is **9**. Usually, this is written as

**gcf(63,81) = 9**

The gcf of 63 and 81 can be obtained like this:

- The factors of 63 are 63, 21, 9, 7, 3, 1.
- The factors of 81 are 81, 27, 9, 3, 1.
- The
*common*factors of 63 and 81 are 9, 3, 1, intersecting the two sets above. - In the intersection factors of 63 ∩ factors of 81 the
*greatest*element is 9. - Therefore, the
**greatest common factor of 63 and 81 is 9**.

Taking the above into account you also know how to find *all* the common factors of 63 and 81, not just the greatest. In the next section we show you how to calculate the gcf of sixty-three and eighty-one by means of two more methods.

## How to find the GCF of 63 and 81

The greatest common factor of 63 and 81 can be computed by using the least common multiple aka lcm of 63 and 81. This is the easiest approach:

Alternatively, the gcf of 63 and 81 can be found using the prime factorization of 63 and 81:

- The prime factorization of 63 is: 3 x 3 x 7
- The prime factorization of 81 is: 3 x 3 x 3 x 3
- The prime factors and multiplicities 63 and 81 have in common are: 3 x 3
- 3 x 3 is the gcf of 63 and 81
- gcf(63,81) = 9

In any case, the easiest way to compute the gcf of two numbers like 63 and 81 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 63,81. The calculation is conducted automatically.

## Use of GCF of 63 and 81

What is the greatest common factor of 63 and 81 used for? Answer: It is helpful for reducing fractions like 63 / 81. Just divide the nominator as well as the denominator by the gcf (63,81) to reduce the fraction to lowest terms.

$\frac{63}{81} = \frac{\frac{63}{9}}{\frac{81}{9}} = \frac{7}{9}$.

## Properties of GCF of 63 and 81

The most important properties of the gcf(63,81) are:

- Commutative property: gcf(63,81) = gcf(81,63)
- Associative property: gcf(63,81,n) = gcf(gcf(81,63),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 63 and 81 is 9. In common notation: gcf (63,81) = 9.

If you have been searching for gcf 63 and 81 or gcf 63 81 then you have come to the correct page, too. The same is the true if you typed gcf for 63 and 81 in your favorite search engine.

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

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