A room needs 200 tiles to pave the floor with a side length of 3 decimeters. How many tiles are needed to pave the floor with an area of 4 square decimeters?
一间房间，用边长3分米的地砖铺地，需要用200块，如果用面积为4平方分米的地砖铺地，需要多少块？
<gadget id="calculator">3 * 3 * 200</gadget>
<output>1_800</output>

<gadget id="calculator">1_800 / 4</gadget>
<output>450</output>

<result>450</result>