# Challenge 1: Find the Greatest Common Divisor

Given two numbers, find their greatest common divisor.

## We'll cover the following

## Problem Statement

Implement a function that takes two numbers, `testVariable1`

and `testVariable2`

and returns their **greatest common divisor**.

### What is the Greatest Common Divisor?

The Greatest Common Divisor of two or more integers is the largest positive integer that divides each of the integers.

For example, take two numbers $42$ and $56$.

$42$ can be completely divided by $1$, $2$, $3$, $6$, $7$, $14$, $21$ and $42$.

$56$ can be completely divided by $1$, $2$, $4$, $7$, $8$, $14$, $28$ and $56$.

Therefore the **greatest common divisor** of $42$ and $56$ is $14$.

### Input

Two variables `testVariable1`

and `testVariable2`

containing numbers.

### Output

The greatest common divisor of `testVariable1`

and `testVariable2`

.

### Sample Input

```
6, 9
```

### Sample Output

```
3
```

### Try it Yourself

Try this challenge yourself before moving on to the solution. Good luck!

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