Round the value 12,984.3432 to the nearest thousandth.

To round the number 12,984.3432 to the nearest thousandth, we look at the digit in the thousandths place, which is 3 in this case. The digit immediately to the right (in the ten-thousandths place) is 2. Since 2 is less than 5, we do not round up. Therefore, the rounded value is 12,984.343. If you're looking for a quick tip while rounding, remember this mnemonic: "Five or more, raise the score; four or less, let it rest!" It’s a fun way to ensure you remember how to handle numbers effectively when rounding.