The town center primary school plans to build a teaching building with a length of 105 meters and a width of 31 meters. What is the floor area of the teaching building?
镇中心小学计划建一座长105米、宽31米的教学楼．该教学楼的占地面积是多少？
<gadget id="calculator">105 * 31</gadget>
<output>3_255</output>

<result>3_255</result>