In multiplication, when one factor is multiplied by 10 and the other factor is divided by 2, the product obtained is how many times the original.
在乘法里，一个因数乘10，另一个因数除以2，所得的积是原来的多少倍．
<gadget id="calculator">2 * 6</gadget>
<output>12</output>

<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 * (1/4)</gadget>
<output>5</output>

<result>5</result>