The floor of a bedroom is 60 decimeters long and 40 decimeters wide. Pave the floor with square bricks with a side length of 2 decimeters. How many square bricks are needed?
一间卧室的地面长60分米，宽40分米．用边长2分米的方砖铺地．需要多少块方砖？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<gadget id="calculator">60 * 10</gadget>
<output>600</output>

<result>600</result>