If the number A is 4 times the number B, then the number B is the number A.
如果甲数是乙数的4倍，那么乙数是甲数的多少．
<gadget id="calculator">1 * 4</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>