The living room of Xiaoya’s house is 8.5 meters long and 4.5 meters wide. The floor is paved with square bricks with a side length of 50 cm. How many square bricks are needed at least?
小亚家的客厅长8.5米，宽4.5米，用边长是50厘米的方砖铺地，至少需要多少块方砖？
<gadget id="calculator">50 / 100</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">4.5 / (1/4)</gadget>
<output>18</output>

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

<result>153</result>