How many floor tiles are needed to pave the floor of a classroom with a length of 9 meters and a width of 6 meters with floor tiles with a side length of 30 cm?
用边长是30厘米的地砖铺一间长9米，宽6米的教室地面，需多少块地砖？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/10) * (3/10)</gadget>
<output>9/100 = around 0.09</output>

<gadget id="calculator">6 / (9/100)</gadget>
<output>200/3 = around 66.666667</output>

<gadget id="calculator">9 * (200/3)</gadget>
<output>600</output>

<result>600</result>