Mom bought a piece of floral cloth with a length of 40 decimeters and a width of 30 decimeters. What is the area of this piece of floral cloth?
妈妈买来一块花布，长为40分米，宽为30分米，这块花布的面积是多少？
<gadget id="calculator">40 * 30</gadget>
<output>1_200</output>

<result>1_200</result>