Shading a grid to show 1 tenth means that for every shaded square there are 9 unshaded squares. To show 1 hundreth, for every shaded square there should be 99 unshaded squares.
Example:
Suppose a grid has 100 squares total. For 1 tenth, you would shade 10 squares, leaving 90 squares unshaded - maintaining the ratio of one shaded square per nine unshaded square. On the same grid, 1 hundreth would require 1 shaded square with the remaining 99 squares unshaded.
