I bought a packages of sandpaper that are 9"x11" with grits 100, 150, 220, 320, and 400. Not sure if I need all those sizes but since I got the variety package, I have lots of choices.
Below you can see that I placed the grit side down to make cuts. I made both horizontal and vertical cuts prior to separating the pieces. This made things go a lot quicker.
Each 9"x11" sheet made 36 - 1"x2" and 9 - 1"x3" pieces.
Now I can start sanding my carving wax doll parts.