This book was created for preservice and inservice teachers with the goal of improving the informal and formal math education of preK-8 students. The authors emphasize using simple, inexpensive games to provide students with learning environments that help to increase their levels of math maturity.The book is a mixture of theory and practice. It contains a careful analysis of a small number of games and links to a large number of games and related resources.The book has a strong emphasis on students learning to develop and test strategies. This is in marked contrast with a common approach to learning about strategies in which students are expected to memorize (and, accept without question) strategies to solve or help solve a variety of problems.