The floor of a classroom is 8 meters long and 4.5 meters wide. If square bricks with an area of 0.4 square meters are used to pave the floor, how many bricks are needed in total?
一间教室的地面长8米，宽4.5米，如果用面积为0.4平方米的方砖铺地面，一共需要多少块？
<gadget id="calculator">4.5 / 0.4</gadget>
<output>11.25</output>

<gadget id="calculator">8 * 11.25</gadget>
<output>90</output>

<result>90</result>