Although it seemed trivial at first, I have noticed a change in the way my students refer to the information. If a student can’t remember something, they don't have to search the room to find what they need. They know they can always find the math concept on this one wall. It took training, but it is not uncommon for students to now get up in the middle of math and walk over to the wall to refresh their memory on what they learned yesterday.
My wall includes my common core "I can" statements, kid-friendly Standards for Mathematical Practice poster, topic specific vocabulary, the essential question, samples of student work, and a mini poster of the concept.
Although it was frustrating to get everything together at first, in hindsight I think it was worth it. My students know the information is there for them to refer to, and they are able to build their knowledge on missed concepts more easily. If students are absent, they know they can check out the math wall for help understanding the topic. I've definitely noticed a difference in my students' learning!