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Question

Estimate each of the following products by rounding off the first number correct to nearest ten and the other number correct to nearest hundred: $$72 \times 258$$.

Solution
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$$72 \times 258$$
$$72$$ to the nearest ten = $$70$$, and
$$258$$ to the nearest ten = $$300$$,
$$\therefore$$ Required product = $$(70 \times 300) = 21,000$$.

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