Xiao Ming's home is 450 meters away from the school. Xiao Ming walks back and forth 3 times a day. How many meters should he walk at least every day?
小明的家离学校450米，小明每天走3个来回，每天至少要走多少米？
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">450 * 6</gadget>
<output>2_700</output>

<result>2_700</result>