A student can use their fingers to write on the page and if there is a mistake, its easy to erase and redo it. Each of these pages can be used in different ways. I took a few shots of some of the blanks and I can see a variety of ways to use them.
This is the 5 large rectangles page. It could easily be used to write down the correct order for solving an equation based on something shown on the board, or perhaps as a way to compare fractions, decimals?
This particular page is good for showing the angles associated with two parallel lines and a transverse.