Why do we move over in the second row when we multiply? Use the example below. Specifically, what is the mathematical reason for moving the 72 over instead of putting it below the 0 and 8? 36 23 108 72 828 The problem can be expanded as + 3 30 + . The sum of the partial products 20 and 20 6 is 720. Thus the 72 above is really 720 (or 72 tens), and so it should be moved one digit over