[
  "12 cm / 3 cm = 4 small cubes per edge. Total small cubes = 4^3 = 64.",
  "SA of one small cube = 6 x 3 x 3 = 54. Total small SA = 64 x 54 = 3,456. Original SA = 6 x 12 x 12 = 864.",
  "Ratio = 3,456 : 864 = 4 : 1."
]