If the side length of a square is 30 decimeters, what is the area of the square in square meters?
一个正方形的边长是30分米，这个正方形面积是多少平方米．
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">30 * (3/10)</gadget>
<output>9</output>

<result>9</result>