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