A cuboid iron water tank without a cover has a length and width of 4dm and a height of 4.5dm. How many square decimeters of iron sheet are needed to make this iron water tank?
一个长方体无盖铁皮水箱，长和宽都是4dm，高4.5dm，做这个铁皮水箱至少需要多少平方分米的铁皮？
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">4 * 4.5 * 4</gadget>
<output>72</output>

<gadget id="calculator">16 + 72</gadget>
<output>88</output>

<result>88</result>