LaVonne estimated 38% of 63 by rounding 38% up to 40%, rounding 63 up to 70, and then multiplying 70 by 0.4 to get 28. Is her estimate reasonable?

LaVonne rounded both 38% and 63% up, so her estimate of 28 is likely too high. A closer estimate uses 40% of 60: 0.4 × 60 = 24, while the exact product is 0.38 × 63 = 23.94. Therefore, her estimate is not very reasonable; the best choice is “No, because she should have rounded 63 down to 60.”

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