Just what is this CUBES thing these kids are bringing home? It is merely and organizational tool to help with problem solving. Each letter represents a step in the process. Having an acronym to help students remember what to do, and in what order when solving math problems can be helpful.
C stands for "Circle"
U stands for "Underline"
B stands for "Box"
E stands for "Evaluate"
S stands for "Solve & Check"
You will find CUBES tiles for your room, also specific mentions of what each step looks like, as well as desk reminders in the same format at the room tiles and specific mentions...
This is just one strategy to use in math when solving problems, so enjoy and solve on!