A piece of paper is folded in half 4 times, and each small piece of paper is ((())/(())) of this paper.
一张纸对折4次，每小块纸是这张纸的((())/(()))．
<gadget id="calculator">2 * 2 * 2 * 2</gadget>
<output>16</output>

<gadget id="calculator">1 / 16</gadget>
<output>1/16 = around 0.0625</output>

<result>1/16 = around 0.0625</result>