Teacher Wang bought a new house for renovation. If you use 36 square decimeter square bricks to pave the floor, you will need 450 yuan. If you use square bricks with a side length of 50 cm, how many bricks will you need to use?
王老师买了一套新房准备装修，如果用36平方分米的方砖铺地，要用450块，如果改用边长50厘米的方砖铺地，要用多少块？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">50 * (1/2)</gadget>
<output>25</output>

<gadget id="calculator">450 / 25</gadget>
<output>18</output>

<gadget id="calculator">36 * 18</gadget>
<output>648</output>

<result>648</result>