I happened across a radio interview with this author and I became very intrigued as I listened to him. He was relating a story about a friend's student who was really struggling with 2nd grade math; just couldn't get it. He offered to spend some time with the friend's child and after a short, 30 minute lesson with him, the kid returned to school as normal, but the teacher noticed a marked difference. On air, he was explaining how he could easily calculate simple addition and subtraction problems by working the opposite way from the way we've been taught at school. You start with the hundreds, then move to the tens, the over to the ones. I have two kids who are kind of struggling at school with their math, mainly due to lack of organization and the problems requiring too many steps. As I read through his book though, I realized that I already do most of the techniques that he shows when I do math in my head. Maybe it's because, as an elementary schooler, I was educated in two very different states with different methods of teaching math. So, unfortunately, I didn't find the book all that illuminating or useful for teaching my kids. I was hoping to read it and find ways to help my kids return to school with a new bag of math tricks like his friend's child that he was talking about in his radio interview. There were lots of little math problems for those of you interested in having some fun doing match calculations.