Different fractions may require different columns, so the best way is to prepare separate "rods" (one column boards), and assemble them together into different many-column boards that are needed for different tasks. Examples of fraction rods: Examples of (extended down) whole number rods that may also be useful: Notice that all these rods contain only geometric progressions with factor two. So they can be extended up and down when needed. Example of a Task
Number Board index |