Xiaoming’s house is decorated with 480 square bricks with an area of 9 square decimeters to just cover the floor of the study. If the square bricks with a side length of 4 decimeters are used instead, how many square bricks are needed?
小明家装修房屋，用面积9平方分米的方砖480块正好铺满书房的地面，如果改用边长4分米的方砖，需要多少块？
<gadget id="calculator">9 * 480</gadget>
<output>4_320</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">4_320 / 16</gadget>
<output>270</output>

<result>270</result>