Round 0.000453 to the nearest thousandth.

0.000

To round a number to the nearest thousandth, you need to look at the digit in the fourth decimal place, which is the thousandth place. In this case, the digit in the thousandth place is 5.

If the digit in the thousandth place is less than 5, we round down (keep the same value). If the digit is 5 or greater, we round up (increase the value).

In this case, the digit is 5 which means we need to round up. To round up, we increase the digit just to the left (the digit in the hundredth place) by 1. Since 4 is less than 5, it remains unchanged.

Therefore, rounding 0.000453 to the nearest thousandth gives us 0.001.