Fold a piece of rectangular paper in half 4 times, how much is each piece of paper
把一张长方形纸的纸片对折4次，每份是这张纸的多少
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 * (1/2) * (1/2) * (1/2) * (1/2)</gadget>
<output>1/16 = around 0.0625</output>

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