If a 4 decimeter long rope is folded in half and then folded in half again, what is the length of each piece of rope in centimeters?
一根4分米长的绳子，对折再对折后，每段绳子长多少厘米．
<gadget id="calculator">4 * 10</gadget>
<output>40</output>

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

<gadget id="calculator">40 * (1/4)</gadget>
<output>10</output>

<result>10</result>