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Round any number to the nearest 10 instantly
• Look at the ones digit
• If 5 or more, round up to next 10
• If less than 5, round down
• 23 → 20 (3 < 5, round down)
• 27 → 30 (7 ≥ 5, round up)
• 25 → 30 (5 ≥ 5, round up)
• 100 → 100 (already a ten)
Enter a number to see the result
| Number | Rounded |
|---|---|
| 11 | 10 |
| 14 | 10 |
| 23 | 20 |
| 34 | 30 |
| 101 | 100 |
| 994 | 990 |
| Number | Rounded |
|---|---|
| 15 | 20 |
| 17 | 20 |
| 25 | 30 |
| 38 | 40 |
| 105 | 110 |
| 995 | 1000 |
Look at the rightmost digit (the ones place) of your number.
Example: In the number 47, the ones digit is 7.
• If the ones digit is 0, 1, 2, 3, or 4: Round DOWN (keep tens digit, make ones digit 0)
• If the ones digit is 5, 6, 7, 8, or 9: Round UP (increase tens digit by 1, make ones digit 0)
Replace the ones digit with 0, adjusting the tens digit if needed.
Example: 47 has ones digit 7 (≥5), so round up: 50
Look at the ones digit (rightmost digit). If it's 5 or greater, round up to the next ten. If it's less than 5, round down to the current ten. For example, 23 rounds to 20, and 27 rounds to 30.
25 rounds to 30. When the ones digit is exactly 5, the standard rounding rule is to round up to the next ten. This is called 'half-up' rounding.
Rounding to the nearest ten makes numbers simpler to work with and easier to understand. It's useful for estimates, mental math, and when exact precision isn't necessary, such as estimating costs or quantities.
Yes! For negative numbers, use the same rule but consider distance. For example, -23 rounds to -20, and -27 rounds to -30. The ones digit rule applies the same way.
Numbers that already end in 0 are already multiples of ten, so they stay the same. For example, 30 rounds to 30, and 100 rounds to 100.
Yes! First look at the entire number including decimals, then round to the nearest whole ten. For example, 23.8 rounds to 20, and 27.5 rounds to 30.