| Places | Tens | Ones | Tenths | Hundredths | Thousandths | |
|---|---|---|---|---|---|---|
| 1 | ||||||
| Number | 2 | 1 | . | 5 | 6 | 1 |
| Rounded Number | 2 | 1 | . | 6 |
- 5 is in the tenths place and 6 is in the hundredths place
- Since the digit in the hundredths place (6) is greater than or equal to 5, add 1 to the digit in the tenths place (5)
- 1 + 5 = 6, so the digit in the tenths place becomes 6
- The digits to the right of the tenths place are dropped
- 21.561 rounded to the nearest tenth (one decimal place) = 21.6
