Xiaosong’s kitchen needs to be paved with floor tiles. Square tiles with a side length of 40 cm are used. There are 90 tiles in total. What is the area of the kitchen in square decimeters?
小松家的厨房要铺地砖，选用边长是40厘米的方砖，一共铺了90块，问厨房的面积是多少平方分米？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">40 * 40 * (9/10)</gadget>
<output>1_440</output>

<result>1_440</result>