| Places | Ones | Tenths | Hundredths | Thousandths | Ten Thousandths | |
|---|---|---|---|---|---|---|
| Number | 0 | . | 3 | 9 | 2 | 1 |
| Rounded Number | 0 | . | 3 | 9 | 2 |
- 2 is in the thousandths place and 1 is in the ten thousandths place
- Since the digit in the ten thousandths place (1) is less than 5, the digit in the thousandths place (2) does not change
- The digit in the ten thousandths place is dropped
- 0.3921 rounded to the nearest thousandth (three decimal places) = 0.392
