The length of a rectangle is 40 decimeters and the width is 25 decimeters. What is its area in square meters?
长方形的长是40分米，宽是25分米，它的面积是多少平方米．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

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

<result>10</result>