Rounding Number Line (opens in a new tab)
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Open the tool (opens in a new tab)Year 5 · Place value · 1:55 · Reasoning extension
Check the claim that 837,264 rounds to 900,000 by comparing the bounds, halfway and distances.

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Try the idea yourself with the interactive model.
Open the tool (opens in a new tab)Practice / Large numbers. Use these ideas for nearest-100,000 cards; the set also includes nearest 10,000 and 1,000,000. Use Instructions for the game rules.
Open the game (opens in a new tab)Practice / Sort one way / within 1,000,000 / nearest 100,000, with six cards and a balanced case mix. Use Instructions for the sorting rules.
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