A classroom is 65 decimeters long and 42 decimeters wide. What is the area of this classroom in square decimeters?
一间教室长65分米，宽42分米．这间教室的面积是多少平方分米？
<gadget id="calculator">65 * 42</gadget>
<output>2_730</output>

<result>2_730</result>