| Places | Hundreds | Tens | Ones | Tenths | |
|---|---|---|---|---|---|
| 1 | 1 | 1 | |||
| Number | 3 | 9 | 9 | . | 6 |
| Rounded Number | 4 | 0 | 0 |
- 9 is in the ones place and 6 is in the tenths place
- Since the digit in the tenths place (6) is greater than or equal to 5, add 1 to the digit in the ones place (9)
- 1 + 9 = 10, so the digit in the ones place becomes 0, and 1 is added to the digit in the tens place (9)
- 1 + 9 = 10, so the digit in the tens place becomes 0, and 1 is added to the digit in the hundreds place (3)
- 1 + 3 = 4, so the digit in the hundreds place becomes 4
- The decimal point and the digit in the tenths place are dropped
- 399.6 rounded to the nearest whole number (ones place) = 400
