| Places | Tens | Ones |
|---|---|---|
| Number | 3 | 1 |
| Rounded Number | 3 | 0 |
- 3 is in the tens place and 1 is in the ones place
- Since the digit in the ones place (1) is less than 5, the digit in the tens place (3) does not change
- 0 replaces the (1) in the ones place
- 31 rounded to the nearest ten = 30
