| Places | Hundreds | Tens | Ones | Tenths | Hundredths | |
|---|---|---|---|---|---|---|
| Number | 6 | 4 | 5 | . | 2 | 1 |
| Rounded Number | 6 | 4 | 5 | . | 2 |
- 2 is in the tenths place and 1 is in the hundredths place
- Since the digit in the hundredths place (1) is less than 5, the digit in the tenths place (2) does not change
- The digit in the hundredths place is dropped
- 645.21 rounded to the nearest tenth (one decimal place) = 645.2
