Xiao Ming's home is 500 meters away from the school, and he has to walk back and forth twice every day to and from school. How many miles does he walk in a day?
小明家离学校500米，他每天上学、放学要走2个来回．请问他一天要走多少千米？
<gadget id="calculator">4 / 1_000</gadget>
<output>1/250 = around 0.004</output>

<gadget id="calculator">500 * (1/250)</gadget>
<output>2</output>

<result>2</result>