Reading book set features literacy-focused readers and activity sheets to help young learners reinforce and develop key literacy skills. Daily practice sheets cover an array of topics and include activities that are aligned to national and state standards. The individual readers discuss literacy concepts in a fun way. Text features, such as bold print, captions, index and glossary, increase comprehension and language fluency. Book set includes 21st Century: Mysteries of Deep Space, Bad Guys and Gals of the High Seas, Where Does Your Money Go?, and 180 Days of Reading for Fifth Grade.