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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 + 4,317
Solution
Rounding off to the nearest hundreds, 439, 334, and 4317 may be rounded off to 400, 300, and 4300 respectively.
400
300
+4300
5000
Rounding off to nearest tens, 439, 334, and 4317 may be rounded off to 440, 330, and 4320 respectively.
440
330
+4320
5090
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