When we want to summarize what we have learned or a subject is hard for us to remember, we make posters. Our whole house is full of them. It is also a good way to easily look up formulas or grammar during teaching. The younger kids also benefit, they walk by and read about what they find interesting. Then we get a chance to talk with them about new areas.
At the end of the year each of our kids make a poster with the different areas they have learned about in math.