A classroom is 9 meters long and 6 meters wide, and the floor is paved with square bricks with a side length of 3 decimeters. At least how many such square bricks are needed?
一间教室长9米，宽6米，用边长3分米的方砖铺地，至少需要这样的方砖多少块？
<gadget id="calculator">9 * 10</gadget>
<output>90</output>

<gadget id="calculator">6 * 10</gadget>
<output>60</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">60 / 9</gadget>
<output>20/3 = around 6.666667</output>

<gadget id="calculator">90 * (20/3)</gadget>
<output>600</output>

<result>600</result>