The classroom in Class 5 and 4 is 6 meters wide and 12.8 meters long. It is paved with square bricks with a side length of 4 decimeters. How many square bricks are needed in total?
五4班教室宽是6米，长是12.8米，用边长是4分米的方砖来铺，一共需要多少块方砖？
<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * (2/5)</gadget>
<output>4/25 = around 0.16</output>

<gadget id="calculator">6 / (4/25)</gadget>
<output>75/2 = around 37.5</output>

<gadget id="calculator">12.8 * (75/2)</gadget>
<output>480</output>

<result>480</result>