If your school doesn't have these and you teach pre-algebra or algebra, you need a practice set. If you are teaching at home, you will need two individual kits. I bought the most complete set, which holds 30 students (more work in pairs). The only thing you should have on hand is some super glue, as some students will find a way to separate the positive colored side from the red, negative side. They seem to be at least average if not the best in terms of durability. Also included is a set of teacher slides in case you don't have a document projector.
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