Round the value 12,984.3432 to the nearest thousandth.

To round the number 12,984.3432 to the nearest thousandth, we focus on the third digit to the right of the decimal point, which is 3. We look at the next digit (the fourth digit after the decimal), which is 2. Since 2 is less than 5, we do not round up the 3. Thus, 12,984.3432 rounded to the nearest thousandth is 12,984.343. If you're ever unsure about rounding, a helpful tip is to remember the phrase "5 and above, give it a shove; 4 and below, let it go!" This can help you decide whether to increase or keep the digit you're rounding. Just keep an eye on those neighboring digits!