If you had a rubik's cube with 10 little squares on each side, and peeled off the outer layer, how many little cubes would you end up with?

There is 6 sides in a cube, multiplying we get the number of squares:
6*10 = 60 little squares. 
Peeling off one layer means subtracting 10 squares from the above numbers like this:
60 - 10 = 50. 

Answer: we end up with 50 littles squares.