There are two cubes, big and small, and the edge length of the small cube is (4/5) the edge length of the big cube. What fraction of the surface area of the small cube is the surface area of the big cube?
有大小两个正方体，小正方体的棱长是大正方体棱长的(4/5)，求小正方体的表面积是大正方体表面积的几分之几？
<gadget id="calculator">16 / 25</gadget>
<output>16/25 = around 0.64</output>

<result>16/25 = around 0.64</result>