| Places | Tens | Ones | Tenths | |
|---|---|---|---|---|
| 1 | 1 | |||
| Number | 1 | 9 | . | 9 |
| Rounded Number | 2 | 0 |
- 9 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 (9)
- 1 + 9 = 10, so the digit in the ones place becomes 0, and 1 is added to the digit in the tens place (1)
- 1 + 1 = 2, so the digit in the tens place becomes 2
- The decimal point and the digit in the tenths place are dropped
- 19.9 rounded to the nearest whole number (ones place) = 20
