| Places | Tens | Ones | Tenths | |
|---|---|---|---|---|
| 1 | ||||
| Number | 2 | 1 | . | 9 |
| Rounded Number | 2 | 2 |
- 1 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 (1)
- 1 + 1 = 2, so the digit in the ones place becomes 2
- The decimal point and the digit in the tenths place are dropped
- 21.9 rounded to the nearest whole number (ones place) = 22
