I try to be as economical and environmentally conscious as possible. A lot of paper can be wasted through homeschooling so when it comes to needing scratch paper for math problems, we use the Boogie Board eWriter. It's a great way to work those math problems, take notes, and doodle. The writing will stay on the tablet until you press the erase button. This tablet does not need to be charged and the contrast writing surface helps with writing legibility. It's very thin, it can fit nicely in a book bag. Additionally, you can buy a case to help keep it protected.