The Dimensions Math KB Textbook corresponds to the KB workbook (required and sold-separately). This textbook also features hands-on workpage elements alongside very simple and direct lessons. Concepts are taught through immersive, visual scenarios created with five characters: Emma, Alex, Sofia, Dio, and Mei. Logically sequenced lessons provide a strong foundation for increasingly complicated math concepts. Chapters in K-B cover numbers to 100, number bonds, addition, subtraction, time, money.