Zhang Qiang used square paper with an area of 1 square decimeter to measure the area of the desk table, and placed 8 sheets along the long side and 5 sheets along the wide side. What is the area of the desk top in square decimeters?
张强用面积1平方分米的正方形纸量课桌桌面的面积，沿着长边摆了8张，沿着宽边摆了5张．这张课桌桌面的面积是多少平方分米？
<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<result>40</result>