The best estimate for 27 would be 30. When estimating, it is often helpful to round to the nearest multiple of 10 for easier calculation. Since 27 is closer to 30 than to 20, rounding to 30 provides a more accurate estimate.
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92 * 27 = approx 90 * 30 = 2700
what is the best estimate of the capacity of a soda can
The best estimate is the true value.
Since sqrt(52) is an irrational number, the best estimate is √52. Any decimal estimate can be improved by adding another digit so none can be BEST.
13.211...