playful, interesting approach to kids, but not really "good in mathematics." In fact by reading the subtitle, I see myself as the content is consistent with the full title of the book. I got fooled by the title track "MATH you said," I thought to find a little crooked manipulation such as how to demonstrate that 1 = 2 in committing a handling error. In short I have several small children 8 to 14 years old and I have not managed to interest a single to "manipulation" that have proved foirreuse such as that ruled surfaces, it is the nerves that you must master !!!