Rounding to 10, 100, 1000
Round any number to the nearest 10, 100, or 1000
What a learner can do afterwards
- Round 4,367 to the nearest 10 (4,370), 100 (4,400), and 1000 (4,000)
- Explain the rounding rule using a number line (which multiple is closer)
- Apply rounding to estimate calculations
1 · Read
Rounding changes a number to the nearest 10, 100, or 1000, so it is easier to work with. You already know place value, so you know which digit sits in the ones, tens, hundreds, and thousands spot. Rounding uses those digits to find the closest round number.
Round 4,367. To the nearest 10, look at the ones digit, 7. It is 5 or more, so 4,367 rounds up to 4,370. To the nearest 100, look at the tens digit, 6. Round up to 4,400. To the nearest 1000, look at the hundreds digit, 3. Round down to 4,000.
Find the digit just to the right of the place you are rounding to. If it is 5, 6, 7, 8, or 9, round up. If it is 0, 1, 2, 3, or 4, round down. Every digit after that becomes zero.
Rounding lets you estimate fast. To add 4,367 and 2,850, round each to the nearest 1000 first: 4,000 + 3,000 = 7,000. That is close to the real answer and quick to check in your head.
Look at the digit right after the place you're rounding to: 5 or more rounds up, 4 or less rounds down, and everything after turns to zero.
More to read
How to Round to the Nearest Hundred
Do you ever see a number like 473 and want to know about how much it is, fast? That's what rounding does for you.
First, find the digit in the tens place. That's the digit right next to the hundreds digit. This tens digit is like a talking digit. It tells the hundreds digit what to do.
If the tens digit is 5, 6, 7, 8, or 9, the hundreds digit rounds up by one. If the tens digit is 0, 1, 2, 3, or 4, the hundreds digit stays the same.
After you decide, change the tens and ones digits to zero. That's your rounded number.
Let's try it with 473. The tens digit is 7. Since 7 is 5 or more, the hundreds digit rounds up from 4 to 5. So 473 rounds to 500.
Now try 231. The tens digit is 3. Since 3 is less than 5, the hundreds digit stays the same. So 231 rounds to 200.
Rounding won't give you the exact amount, but it gives you a quick guess that's close enough for everyday jobs, like estimating how much your shopping cart costs.
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2 · Watch
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Where it sits
Learn first
Optional connections
Where this leads
Jobs that lean on this skill. Follow one to see everything it is built on.
20 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.