Xiaoqiang runs for 21 minutes every morning, and his speed is 138 m/min. About how many meters does Xiaoqiang run every morning?
小强每天早上跑步21分钟，他的速度是138米/分，小强每天早上大约跑多少米？
<gadget id="calculator">138 * 21</gadget>
<output>2_898</output>

<result>2_898</result>