A classroom is 12 meters long and 6 meters wide. Now, square floor tiles are pasted on the floor of the classroom. The side length of the floor tiles is 3 decimeters. How many floor tiles are needed to pave this classroom?
一间教室长12米，宽6米，现在给教室地面贴上正方形地砖，地砖的边长是3分米．铺这间教室需要地砖多少块？
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">100 / 9</gadget>
<output>100/9 = around 11.111111</output>

<gadget id="calculator">12 * 6 * (100/9)</gadget>
<output>800</output>

<result>800</result>