The area of a classroom is 56 square meters, and the floor is paved with square tiles with a side length of 0.4 meters. How many pieces of this kind of tiles are needed in total?
一间教室的面积是56平方米，用边长0.4米的正方形瓷砖铺地，共需这种瓷砖多少块．
<gadget id="calculator">0.4 * 0.4</gadget>
<output>0.16</output>

<gadget id="calculator">56 / 0.16</gadget>
<output>350</output>

<result>350</result>