Xiao Ming is 540 meters from home to school, and he has to walk back and forth twice a day. How many meters does Xiao Ming need to walk every day?
小明从家到学校有540米，他每天要走两个来回，小明每天需走多少米？
<gadget id="calculator">540 * 2 * 2</gadget>
<output>2_160</output>

<result>2_160</result>