Over 4 million in print! Designed by leading experts?? books in the Complete Book series help children in grades preschool-6 build a solid foundation in key subject areas for learning success. Complete Books are the most thorough and comprehensive learning guides available?? offering high-interest lessons to encourage learning and fun?? full-color illustrations to spark interest. Each book also features challenging concepts and activities to motivate independent study?? and a complete answer key to measure performance and guide instruction.