<p>I want to get the base 10 logarithm of a Fixnum using Ruby, but found that n.log or n.log10 are not defined. Math::log is defined but uses a different base than 10.</p>

<p>What is the easiest way to get the base 10 logarithm of a Fixnum?</p>

Reading the documentation for module Math the answer is really obvious:
```
```
Math::log10(n)
```
```
This gives the base 10 logarithm of n.