If the side length of a square is 4 decimeters, what is the area in square centimeters?
一个正方形的边长是4分米，面积是多少平方厘米．
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

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

<result>1_600</result>