A rectangular playground is 100 meters long and 50 meters wide. Xiao Ming runs 4 laps around the sports field, how many meters will he run in total?
一个长方形运动场，长100米，宽50米．小明绕运动场跑4圈，一共要跑多少米？
<gadget id="calculator">100 + 50</gadget>
<output>150</output>

<gadget id="calculator">150 * 2 * 4</gadget>
<output>1_200</output>

<result>1_200</result>