Xiao Ming's home is 400 meters away from the school. He walks to school and home every day. If he goes home for lunch, how many meters will he walk a day?
小明的家离学校有400米远，他每天都步行上学和回家，如果他中午回家吃饭，他一天要步行多少米？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">400 * 4</gadget>
<output>1_600</output>

<result>1_600</result>