Before we solve this rounding problem, we must first know that one divided by three is.

Luckily, (1/3) is a very well known fraction with a very simple and easy to find answer as well:

**(1/3) = 0.3333333333….**

The threes continue on forever, but for this problem we’re only concerned with the first four decimal places. **Three** is the number in the thousandths spot, as well as every other decimal spot:

0.33**3**3333333…

The number in the ten-thousandths spot is also a three, and therefore the number is not rounded up to a four, making:

**1/3 rounded to the nearest thousandth equal to 0.333.**