The length of the desk is 12 decimeters and the width is 7 decimeters. What is the area of this desk in square decimeters?
办公桌的长12分米，宽7分米，这张办公桌的面积是多少平方分米？
<gadget id="calculator">12 * 7</gadget>
<output>84</output>

<result>84</result>