Rounding Number Line (opens in a new tab)
Try the idea yourself with the interactive model.
Open the tool (opens in a new tab)Year 5 · Place value · 1:51 · Short worked example
Use bounding multiples and halfway to round 83,421 and 397,612 to the nearest 10,000, including a boundary crossing.

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Try the idea yourself with the interactive model.
Open the tool (opens in a new tab)Choose Large numbers. Use this explanation for nearest-10,000 cards; the set also includes other rounding accuracies.
Open the game (opens in a new tab)Choose an appropriate number range and nearest 10,000. The video explains rounding; use Instructions for the sorting rules.
Open the game (opens in a new tab)Start with the five-digit example at 0:00–0:39. The example from 0:40 extends beyond 100,000.
Open the lesson (opens in a new tab)Supporting revision of rounding to 10,000. This video does not introduce rounding to 100,000.
Open the lesson (opens in a new tab)