I learned that to get the volume you the to use a formula.
l x w x h =
3 x 3 x 3 = 27cm3
27 cubes = 27cm3
To get the Surface Area you also need a formula. You also have to add all the area of the square, top, bottom, sides, the back and the front.
Surface Area = 3 + 3 + 3 + 3 + 3 + 3 = 24 cm2