How should high school math be taught? Ask ten different teachers, administrators, experts, and education reformists and you'll get ten different answers. How shouldn't it be taught? By drilling for standardized tests. Yet that's what happens every day all over the United States. Even in those high-performing charter and private schools that select their students or have lotteries, they use lessons designed to prepare students to test. This results in young adults that can take tests, not think critically. This book suggests something different. Not a different kind of school or education system, merely a way to create a critical thinker without sacrificing the ability to answer standardized test questions. It's not something I came up with, in fact, the method has been around for centuries. If you're interested in taking a break from the education reform debates and seeing what might really work in a high school math class, this book is for you.