Xiao Ming's home is 500 meters away from the school. He goes to school and walks back and forth every day. How many meters does he walk a day?
小明家离学校500米，他每天上学、回家走一个来回．他一天要走多少米？
<gadget id="calculator">500 * 2</gadget>
<output>1_000</output>

<result>1_000</result>