There are 10 sticks, how do you take out (2/5) of them? Let's do the math.
有10根小棒，取出它的(2/5)，你怎样取？摆一摆，算一算吧．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">10 * (2/5)</gadget>
<output>4</output>

<result>4</result>