The Student Book is the consumable textbook of the program. Chapters and daily lessons are based on the Readiness-Engagement-Mastery model of learning used in Singapore classrooms. In the Readiness phase, students make connections to previously learned concepts and skills to be sure they have the base knowledge to succeed with learning goals. In the Engagement phase, students learn by doing and construct new knowledge through engaging activities and guided inquiry. In the Mastery phase, students gain fluency, confidence, and deeper conceptual understanding through practice and problem solving. Note: Two books (A and B) for each grade correspond to the two halves of the school year. Answer key in Teacher’s Guide and Home Instructor’s Guide. Soft cover. .