Answer
30.129
Work Step by Step
We are asked to round 30.1290 to the nearest thousandth.
Step 1. Draw a cut-off line after the thousandths place. We are cutting off the 0. It will be dropped.
Step 2. We look at the first number after the cut-off line, which is 0.
Step 3. Since this number is less than 5, the digit in the thousandths place stays the same.
Therefore, 30.1290 rounded to the nearest thousandth is 30.129.
