Estimate each of the following products by rounding off the first number correct to nearest ten and the other number correct to nearest hundred.

87 × 307

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Solution

87 will be rounded to 90 when rounded to the nearest 10
307 will be rounded to 300 rounded to the nearest 100

87 × 307 $\approx$ 90 × 300 = 27,000

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Estimate the following product by rounding off each number to nearest tens :

$87 \times 32$

376 \times 123

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