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Question
Estimate the following numbers to nearest tens and then add or subtract.
Solution
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Estimate each sum to the nearest ten: (356 + 275)
Estimate each sum to the nearest hundred: (236 + 689)
Estimate each difference to the nearest hundred: (7258 − 2429)
Give a rough estimate (by rounding off to nearest hundreds) and also a closer estimate (by rounding off to nearest tens):
775 - 390
Estimate the following using the general rules:
25,688 + 4,213
