The area of a square of 40 cm * 40 cm = the area of how many squares of 10 cm * 10 cm.
40厘米*40厘米的正方形面积=多少个10厘米*10厘米的正方形的面积．
<gadget id="calculator">40 * 40</gadget>
<output>1_600</output>

<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">1_600 / 100</gadget>
<output>16</output>

<result>16</result>