Xiaohua's room is 5.1 meters long and 3 meters wide. If you use square floor tiles with a side length of 30 centimeters, how many pieces are needed?
小华的房间长5.1米，宽3米，如果用边长30厘米的正方形地砖铺地，需要多少块？
<gadget id="calculator">30 * 30</gadget>
<output>900</output>

<gadget id="calculator">10_000 / 900</gadget>
<output>100/9 = around 11.111111</output>

<gadget id="calculator">5.1 * 3 * (100/9)</gadget>
<output>170</output>

<result>170</result>