The area of the square is 1.8 hectares. If you use square floor tiles with a side length of 4 decimeters to pave the floor, how many such floor tiles are needed?
广场的面积是1.8公顷，用边长4分米的正方形地板砖铺地，共需要多少块这样的地板砖？
<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * (2/5)</gadget>
<output>4/25 = around 0.16</output>

<gadget id="calculator">10_000 / (4/25)</gadget>
<output>62_500</output>

<gadget id="calculator">1.8 * 62_500 * 10</gadget>
<output>1_125_000</output>

<result>1_125_000</result>