I'm a math major and during my classroom observations, I read this book to 4th graders and they loved it. The teacher ask me to stay and read it to the 5th and 6th graders. The book is illustrated beautifully and it really makes students and adults understand that math is a part of our every day life. I love the way the authors relate every aspect of the book to math: the price of the book is an addition problem, the price is also in available in binary, it's for ages >6 and <99!!! The fact that Mrs. Fibonacci is her teach is just too cool! I've become a math lunatic myself. Thanks to the authors for such grand creativity!