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Mathematics for IGCSE & O level - Estimation (Section 2 - No. 3)

If the cost of one pen is $2.73. Estimate the total cost of 12 pens by rounding to the nearest whole number.
$24
$33
$30
$25

解释

Round $2.73 to $3 and multiply by 12: 3 * 12 = $36.

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