The length and width of the school library floor are 16m and 4m respectively, how many square floor tiles with a side length of 80cm are needed at least?
学校图书馆地面的长和宽分别是16m和4m，用边长为80cm的正方形地砖铺地，至少需要多少块？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) * (4/5)</gadget>
<output>16/25 = around 0.64</output>

<gadget id="calculator">4 / (16/25)</gadget>
<output>25/4 = around 6.25</output>

<gadget id="calculator">16 * (25/4)</gadget>
<output>100</output>

<result>100</result>