Put class list in a frame to easily mark and erase. It would be cool to add a line at the top where you could write what you're checking off such as "Field Trip Money." that way you can easily keep track with a collection and the kids can see it, eliminating the constant questions!
Beaded number rods for subtraction! Great visual for students with special needs. Adding concrete materials when performing simple operations, helps build number sense to ensure students are relating quantities to symbols (numbers). For this and more great ways to use beads and pipe cleaners in your math lesson, go to: http://commoncoreconnectionusa.blogspot.com/2014/12/beaded-number-rods.html