The floor of a conference room is paved with 1560 square floor tiles with a side length of 5 decimeters. How many square meters is the floor of this conference room?
一个会议室的地面由1560块边长为5分米的正方形地砖铺成，这个会议室的地面有多少平方米？
<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (1/2) * 1_560</gadget>
<output>390</output>

<result>390</result>