This is just foam board, a pipe cleaner and one bead. You can buy the foam board at the dollar store. Two sheets will make a class set. I used a printed number line but you can just draw one on. I like the red and black. I just cut two small slits in the foam board so the pipe cleaner would fit firmly, the same way I would make a rekenrek. The student would just move the number of spaces they are adding or subtracting to get the answer: 4+3=7.