| Places | Ones | Tenths | Hundredths | Thousandths | Ten Thousandths | |
|---|---|---|---|---|---|---|
| 1 | 1 | 1 | 1 | |||
| Number | 2 | . | 9 | 9 | 9 | 9 |
| Rounded Number | 3 | . | 0 | 0 | 0 |
- 9 is in the thousandths place and 9 is in the ten thousandths place
- Since the digit in the ten thousandths place (9) is greater than or equal to 5, add 1 to the digit in the thousandths place (9)
- 1 + 9 = 10, so the digit in the thousandths place becomes 0, and 1 is added to the digit in the hundredths place (9)
- 1 + 9 = 10, so the digit in the hundredths place becomes 0, and 1 is added to the digit in the tenths place (9)
- 1 + 9 = 10, so the digit in the tenths place becomes 0, and 1 is added to the digit in the ones place (2)
- 1 + 2 = 3, so the digit in the ones place becomes 3
- The digit in the ten thousandths place is dropped
- 2.9999 rounded to the nearest thousandth (three decimal places) = 3.000
