Practice Rounding in Math
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
Replacing a number with a nearby simpler approximation at a specified place value, using the digit to the right to decide.
Simplifying for easier calculation or communication—19.87 becomes 'about 20'.
Example 1
easyRound 4{,}736.482 to (a) the nearest hundred, (b) the nearest tenth.
Example 2
mediumRound \pi \approx 3.14159265\ldots to 4 significant figures. Then round 0.0038472 to 3 significant figures.
Example 3
easyRound 8.965 to the nearest hundredth. Then round -3.45 to the nearest tenth.
Example 4
mediumA measurement is given as 5.28 m. Round to the nearest metre and estimate the percent error introduced.