I saw a few pictures of manipulatives made of construction paper and did them in my class, but now the pictures are gone. I found out yesterday that Dinah Zike's books might be the source of the ideas I was stealing. She has several books online at http://www.dinah.com/. I can't find the books used for a reasonable price, and I am weary about ordering things online without knowing exactly what I'm getting, so I have a few questions. Has anyone ever used her books? If you have used them what books would you recommend for 6th grade math (there's a middle and high school book and a K-6 book)?