Starting math class with a line dance from 2000 is bound to get some giggles. This engaging partner project is a great alternative assessment for transformations in Geometry, and with some tweaks, would be great for Algebra 1, Algebra 2, and Trig as well! The activity includes directions, Cha Cha Slide lyrics, and a scoring rubric. You can also change or modify the final product if posters aren't your thing.