A house needs 960 square bricks with an area of 9dm**2 to pave the floor. If square bricks with a side length of 2dm are used, how many bricks are needed?
一间房子用面积9dm**2的方砖铺地需要960块，如果用边长是2dm的方砖，需要多少块？
<gadget id="calculator">9 * 960</gadget>
<output>8_640</output>

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

<gadget id="calculator">8_640 / 4</gadget>
<output>2_160</output>

<result>2_160</result>