Xiaoming's rectangular dining room is 4.5 meters long and 3.5 meters wide. How many square bricks with a side length of 5 decimeters are needed to pave the floor?
小明家的长方形餐厅，长是4.5米，宽是3.5米．用边长是5分米的方砖铺地，至少需要多少块？
<gadget id="calculator">4.5 * 3.5</gadget>
<output>15.75</output>

<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (1/2)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">15.75 / (1/4)</gadget>
<output>63</output>

<result>63</result>