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Estimate the product of the numbers 81 and 286 using the general rule.

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22,400

23,200

24,400

25,200

answer is B.

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Detailed Solution

The given numbers are 81 and 286.

The general rule says to round off each factor to its greatest place, then multiply the rounded-off factors.

81 can be rounded off to the nearest ten as 80.

286 can be rounded off to the nearest tens as 290.

80 × 290 = 23,200

Thus, the estimated product of the numbers 81 and 286 is 23,200.

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