A classroom is 8.5 meters long and 4.5 meters wide, and the floor is paved with square tiles with an area of 0.25 square meters. How many tiles are needed in total?
一间教室长8.5米，宽4.5米，用面积为0.25平方米的方瓷砖铺地，一共需要多少块瓷砖？
<gadget id="calculator">4.5 / 0.25</gadget>
<output>18</output>

<gadget id="calculator">8.5 * 18</gadget>
<output>153</output>

<result>153</result>