Number of small cubes having two faces coloured = 8 + 8 + 4 + 4 = 24 and Number of small cubes having only one face coloured = 4 x 6 = 24 and Number of small cubes having no face coloured = 4 + 4 = 8 Therefore, total number of small cubes whose at the most two faces are coloured = 24 + 24 + 8 = 56.