The floor of the library is 25 decimeters long and 12 decimeters wide. If floor tiles with a side length of 2 decimeters are used to pave the floor of the library, how many such floor tiles are needed?
图书馆的地面长25分米，宽12分米，若用边长是2分米的地砖铺图书馆地面，需要这样的地砖多少块？
<gadget id="calculator">25 * 12</gadget>
<output>300</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">300 / 4</gadget>
<output>75</output>

<result>75</result>