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In my opinion, this is the best series of books ever written on Mathematics. The authors are genius and wrote a book that makes mathematics easy and fun. There are numerous test questions with answers. The simplicity with which the authors illustrate mathematical principals, still boggles my mind today, thirty years after I first read the books in school. As a parent, former school teacher and Mathematician, I wholeheartedly recommend this gem of a series.
Thank you, Messer's Channon, Smith and Head. You've had such a positive impacted the lives on millions worldwide.