If a square tablecloth with a side length of 5 cm is sewed with lace around it, how many decimeters of lace do you need at least?
一个边长是5厘米的正方形桌布，给它的四周缝上花边，至少需要多少分米的花边？
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">20 / 10</gadget>
<output>2</output>

<result>2</result>