Use this resource to display math group rotations. My math groups are the names of shapes (triangle, pentagon, hexagon, octagon). This grouping system helps the students remember their shape names, but also helps me to know off the top of my head the level of each group. The higher the number of sides on the shape, the higher the group is on the specific skill we're working on.
This rotation system has been very beneficial in my classroom. I hope you're able to find it useful as well.