Xiao Ming ran 2 and a half laps along the playground track, each lap was about 400 meters, how many kilometers did he run?
小明沿着操场跑道跑了2圈半，每圈大约400米，他大约跑了多少千米．
<gadget id="calculator">2 * 400</gadget>
<output>800</output>

<gadget id="calculator">800 + 200</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 / 1_000</gadget>
<output>1</output>

<result>1</result>