A square room with a side length of 6 meters is laid on the floor with square floor tiles with a side length of 3 decimeters. How many such floor tiles are needed in total?
一个正方形的房间，边长是6米，在地面铺上边长3分米的正方形地砖，一共需要这样的地砖多少块？
<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">6 * 6 * (100/9)</gadget>
<output>400</output>

<result>400</result>