Rounding helps us simplify numbers! When rounding a three-digit number to the nearest ten, we look at the ones digit. If the ones digit is 0, 1, 2, 3, or 4, we round down, meaning the tens digit stays the same and the ones digit becomes 0. If the ones digit is 5, 6, 7, 8, or 9, we round up, meaning the tens digit increases by one and the ones digit becomes 0. For example, 232 rounded to the nearest ten is 230, and 238 rounded to the nearest ten is 240.
Match the term with the correct definition:
| Term | Definition |
|---|---|
| 1. Rounding | A. The digit in the rightmost place of a number |
| 2. Nearest Ten | B. Simplifying a number to a nearby value |
| 3. Ones Digit | C. The closest multiple of ten |
| 4. Round Up | D. To increase a number to the next highest ten |
| 5. Round Down | E. To decrease a number to the next lowest ten |
Fill in the missing words in the paragraph below:
When rounding to the nearest ____, we look at the ____ digit. If the ones digit is 5 or greater, we ____ up. If it is less than 5, we round ____.
Explain in your own words why rounding is a useful skill in everyday life. Provide at least two examples.
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