Round numbers to the nearest 100

The learner understands that a whole number is approximated by the nearest multiple of 100, using its place-value structure and position on a number line. For three-digit numbers through 1,000, numbers with fewer than 50 beyond a hundred are rounded down, while numbers 50 or more beyond it are rounded up, including halfway cases; this foundation supports estimation and later work with larger numbers, but not decimals, negative numbers, or general error bounds.

Detailed Explanation: Round numbers to the nearest 100

To round a whole number to the nearest $100$ , find the two multiples of $100$ that the number lies between. Then decide which hundred is closer.

If the last two digits are from $00$ to $49$ , round down.
If the last two digits are from $50$ to $99$ , round up.

Example: Round $647$ to the nearest $100$

Find the hundreds it is between:
$647$ lies between $600$ and $700$ .
Look at the last two digits:
The last two digits are $47$ .
Compare $47$ with $50$ :
Since $47$ is less than $50$ , $647$ is closer to $600$ than to $700$ .
Write the rounded number:

647 \approx 600

So, $647$ rounded to the nearest $100$ is $600$ .

Learn by doing: Round numbers to the nearest 100

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Rounding Whole Numbers - Hundreds to Nearest Hundred

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