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Question

Give a rough estimate (by rounding off to nearest hundreds) and also a closer estimate
(by rounding off to nearest tens):
439 + 334 + 4317

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Solution

By rounding off to nearest hundreds, the rough estimate of their sum will be:

439 round off to= 400334 round off to= 3004317 round off to= 4300Estimated sum= 5000

By rounding off to nearest tens

439 round off to= 440334 round off to= 3304317 round off to= 4320Estimated sum= 5090

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