To pave a room with square bricks, it takes 800 pieces to use square bricks with a side length of 2 decimeters, and how many pieces are needed to use square bricks with a side length of 4 decimeters?
用方砖铺一间房间，用边长2分米的方砖需要800块，改用边长是4分米的方砖，需要多少块？
<gadget id="calculator">2 * 2 * 800</gadget>
<output>3_200</output>

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

<gadget id="calculator">3_200 / 16</gadget>
<output>200</output>

<result>200</result>