The **gcf of 64 and 40** is the largest positive integer that divides the numbers 64 and 40 without a remainder. Spelled out, it is the greatest common factor of 64 and 40. Here you can find the gcf of 64 and 40, 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 64 and 40, but also that of three or more integers including sixty-four and forty for example. Keep reading to learn everything about the gcf (64,40) and the terms related to it.

## What is the GCF of 64 and 40

If you just want to know *what is the greatest common factor of 64 and 40*, it is **8**. Usually, this is written as

**gcf(64,40) = 8**

The gcf of 64 and 40 can be obtained like this:

- The factors of 64 are 64, 32, 16, 8, 4, 2, 1.
- The factors of 40 are 40, 20, 10, 8, 5, 4, 2, 1.
- The
*common*factors of 64 and 40 are 8, 4, 2, 1, intersecting the two sets above. - In the intersection factors of 64 ∩ factors of 40 the
*greatest*element is 8. - Therefore, the
**greatest common factor of 64 and 40 is 8**.

Taking the above into account you also know how to find *all* the common factors of 64 and 40, not just the greatest. In the next section we show you how to calculate the gcf of sixty-four and forty by means of two more methods.

## How to find the GCF of 64 and 40

The greatest common factor of 64 and 40 can be computed by using the least common multiple aka lcm of 64 and 40. This is the easiest approach:

Alternatively, the gcf of 64 and 40 can be found using the prime factorization of 64 and 40:

- The prime factorization of 64 is: 2 x 2 x 2 x 2 x 2 x 2
- The prime factorization of 40 is: 2 x 2 x 2 x 5
- The prime factors and multiplicities 64 and 40 have in common are: 2 x 2 x 2
- 2 x 2 x 2 is the gcf of 64 and 40
- gcf(64,40) = 8

In any case, the easiest way to compute the gcf of two numbers like 64 and 40 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 64,40. The calculation is conducted automatically.

## Use of GCF of 64 and 40

What is the greatest common factor of 64 and 40 used for? Answer: It is helpful for reducing fractions like 64 / 40. Just divide the nominator as well as the denominator by the gcf (64,40) to reduce the fraction to lowest terms.

$\frac{64}{40} = \frac{\frac{64}{8}}{\frac{40}{8}} = \frac{8}{5}$.

## Properties of GCF of 64 and 40

The most important properties of the gcf(64,40) are:

- Commutative property: gcf(64,40) = gcf(40,64)
- Associative property: gcf(64,40,n) = gcf(gcf(40,64),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 64 and 40 is 8. In common notation: gcf (64,40) = 8.

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

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