The stadium needs to be paved with lawns. It is known that the stadium is 60 meters long and 45 meters wide. If each piece of lawn is 5 square decimeters, how many pieces of such a large lawn are needed?
体育场要铺草坪，已知体育场长60米，宽45米，用每块为5平方分米的草坪铺，需要这样大的草坪多少块？
<gadget id="calculator">45 / 5</gadget>
<output>9</output>

<gadget id="calculator">60 * 9</gadget>
<output>540</output>

<result>540</result>