If the floor of a store is made of square bricks with an area of 9 square decimeters, 800 square bricks will just cover it completely. If the floor is paved with square bricks with a side length of 6 decimeters, how many bricks are needed at least?
一家店铺的地面如果用面积9平方分米的方砖，800块正好铺满．如果用边长是6分米的方砖铺地，至少需要多少块？
<gadget id="calculator">9 * 800</gadget>
<output>7_200</output>

<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">7_200 / 36</gadget>
<output>200</output>

<result>200</result>