Here's a couple of other posters that would be good to put up in your room. One is help the kids remember how to do long division and the other is a poem to help them learn about 3D shapes and remember what they are and things like. However, the 3D shapes thing doesn't even have to be a poster, you could just pass it out to each student to use as a reference or just use it to teach them about the shapes.
Credit Picture 1: http://followpics.co/great-poster-for-long-division-would-be-great-in-math-notebooks/
Credit Picture 2: Meet Miss Parker - http://meetmissparker.blogspot.com/2013/03/spring-sale-common-core-math-3d-shapes.html