My Book Of Number Games 1-150 (Kumon Workbooks)

(From Amazon): This book builds on the skills developed by My Book of Number Games 1-70. In addition to reinforcing number recognition and number sequencing skills, My Book of Number Games 1 - 150 will help children understand the concept of a "digit," which will prepare them for higher-level multi-digit calculations. Mastering the concepts introduced in Kumon's two Number Games books will help children succeed when they progress to arithmetic and more advanced math.