Alexia ran three laps around her neighborhood. Each lap is 1 and 3 eighths miles. Which is the best estimate of the number of miles that Alexia ran?

Each lap is 1 3/8 miles, which is about 1 1/2 miles. For three laps, 3 × 1 1/2 = 4 1/2 miles, so the best estimate is 4 1/2 miles.

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