Rounding Calculator › round 21 to the nearest 10
Round 21 to the Nearest 10
21 rounded to the nearest ten = 20
| Rounded to nearest 10 | 20 |
| Rounded up | 30 |
| Rounded down | 20 |
Why 21 rounds to 20
21 sits between 20 and 30 on the number line. It is 1 above 20 and 9 below 30, so it is closer to 20.
The shortcut: look at the digit just right of the tens place — that deciding digit is 1. Since 1 is less than 5, you round down, 21 → 20. The halfway mark here is 25.
Round 21 to other place values
Round nearby numbers to the nearest 10
Frequently asked questions
What is 21 rounded to the nearest 10?
21 rounded to the nearest ten (10) is 20.
How do you round 21 to the nearest 10?
Look at the digit to the right of the tens place. Here 21 sits between 20 and 30; since it is closer to 20 (round-half-up), the answer is 20.