My students love these scavenger hunts. I have never seen them so actively engaged and excited about combining like terms. Its format is easy to setup for teachers and gets students out of their seats. It is self-checking and allows teachers to work 1-on-1 with students who need remediation. This scavenger hunt has a branches of mathematics theme which leads to great discussions with students about what a mathematician is and does. Awesome activity to add to your unit!
6.EE.A.3, 7.EE.A.1, 8.EE.C7, HAS-SSE.B.3