lesson
Choose an appropriate precision
1 · Learn
Rounding depends on the requested place. To round 347,820 to the nearest ten thousand, compare 340,000 and 350,000. It is above their midpoint, 345,000, so choose 350,000.
An approximate attendance may be rounded, but an exact seat allocation cannot ignore spare people. Explain why the chosen precision suits the question.
2 · Worked example
To the nearest thousand, 347,820 becomes 348,000. The same original number has different rounded forms for different purposes.
3 · Your turn
Round 684,251 to the nearest ten, hundred, thousand, ten thousand and hundred thousand.
Check your answer
684,250; 684,300; 684,000; 680,000; 700,000.
4 · Apply your learning
Mark benchmarks and midpoints for two rounding places. Discuss one situation needing an exact answer and one allowing an estimate.
Adult guidance and safety
Model the calculation or measurement before relying on a procedure. Explain estimates, units and checks. Use a ruler/protractor and suitable diagrams where needed; text examples alone do not establish practical skill or fluency.
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