Targeting Mathematics Work-Textbook Primary 4 Book A is based on Thailand's newly revised curriculum of B.E. 2560 (A.D. 2017). This book is adapted and developed from a Singapore's best seller series of Primary Mathematics approved by Singapore's MOE. This series utilizes the CPA approach (Concrete-Pictorial-Abstract or Doing-Seeing-Symbolic stages) to help the students understand the abstract concepts more easily. It also employs bar modeling which helps the students solve the problems more systematically.