Estimate each of the following products by rounding off the first number correct to nearest ten and the other number correct to nearest hundred: $$28 \times 287$$.
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Solution
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$$28 \times 287$$ $$28$$ to the nearest ten = $$30$$, and $$287$$ to the nearest ten = $$300$$, $$\therefore$$ Required product = $$(30 \times 300) = 9,000$$.
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