You don't need to be highly skilled in arts and crafts and DIY to make these board eraser mitts. All you need to do is buy some large microfiber cloths from the dollar store and cut them up into smaller pieces. Then, stitch up three of the edges so that you're left with a pocket that you can put your hand into. This will be super cheap, but also super effective.
If you have a load of these handy at the start of the term, we guarantee that they'll last you until the end of the school year. Plus, you have the bonus of knowing that you made them yourself.