Grandpa Wang runs along a 450-meter-long path every morning, and returns home after running 5 rounds. How many meters does Grandpa Wang run every morning?
王爷爷每天早上沿一条长450米的小路跑步，跑5个来回后回家．王爷爷每天早上跑多少米？
<gadget id="calculator">450 * 2 * 5</gadget>
<output>4_500</output>

<result>4_500</result>