I think someone around here has suggested several times using graph paper for writing and writing out math problems, which are great uses, but it seems to me it might really aid in getting a triangle out of a perfectionist child! smile (Ellipses, maybe?)

Also, we used this book, for fun cutting crafts, and the kids enjoyed it a lot...
http://www.amazon.com/First-Book-Cutting-Kumon-Workbooks/dp/4774307084


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