Yucai Primary School plans to build a teaching building with a length of 105 meters and a width of 31 meters. Estimate the approximate floor area of the teaching building in square meters.
育才小学计划建一座长105米，宽31米的教学楼．估一估，该教学楼的占地面积大约是多少平方米．
<gadget id="calculator">31 - 1</gadget>
<output>30</output>

<gadget id="calculator">100 * 30</gadget>
<output>3_000</output>

<result>3_000</result>