The length and width of the floor of Xiao Ming's bedroom are 4 meters and 6 meters respectively. To cover the entire floor with environmentally friendly square floor tiles with a side length of 40 cm, at least how many such floor tiles are needed?
小明的卧室的地面的长和宽分别是4米和6米，要用边长为40厘米的环保型正方形地砖铺满整个地面，至少需要多少块这样的地砖？
<gadget id="calculator">40 / 100</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">4 / (4/25)</gadget>
<output>25</output>

<gadget id="calculator">6 * 25</gadget>
<output>150</output>

<result>150</result>