A square wooden box without a cover has a side length of 0.9 meters. How many square decimeters of boards are needed to make this wooden box?
一个无盖的正方体木箱，棱长是0.9米，做这个木箱至少需要木板多少平方分米？
<gadget id="calculator">0.9 * 10</gadget>
<output>9</output>

<gadget id="calculator">9 * 9 * 5</gadget>
<output>405</output>

<result>405</result>