Subtract (1/2) from 4 each time, how many times to get 0.
从4里每次减去(1/2)，减去多少次后得0．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4 / (1/2)</gadget>
<output>8</output>

<result>8</result>