Just received this book about 2 hours ago and started flipping through it.  I am known for 2 things.  Killing plants and not being able to do math of any kind.  After reading the first part of the book I called my son down and had him make up some math problems.  After getting every one correct he was like, "Mom, where are you hiding your cheat sheets"?  Just ordered another 2 copies so each of my boys will have "summer reading" that I approve of.  You can't go wrong with this book.