Write the fourth number according to the law: 0.5(1/4), 12.5%, how much.
按规律写出第四个数：0.5(1/4)，12.5%，多少．
<gadget id="calculator">12.5 / 100</gadget>
<output>0.125</output>

<gadget id="calculator">0.125 / 2</gadget>
<output>0.0625</output>

<result>0.0625</result>