The circumference of the playground is 400 meters. Xiao Ming insists on running 4 laps every day. How many meters does he run every day?
运动场周长是400米，小明每天坚持跑4圈，他每天跑了多少米？
<gadget id="calculator">400 * 4</gadget>
<output>1_600</output>

<result>1_600</result>