A living room with a length of 5 meters and a width of 4 meters is going to be paved with square floor tiles with a side length of 5 cm. At least how many such floor tiles need to be bought.
一个长5米、宽4米的客厅，准备铺上边长是5厘米的正方形地砖，至少需要买这样的地砖多少块．
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">10_000 / 25</gadget>
<output>400</output>

<gadget id="calculator">5 * 4 * 400</gadget>
<output>8_000</output>

<result>8_000</result>