Mark Twain’s Pre-Algebra resource book for fifth to twelfth grades focuses on these concepts:-number systems-variables-exponents-radicals-equations-statistics-probability-the rectangular coordinate systemThis Mark Twain math resource breaks down pre-algebra into concepts that can be mastered so students have a solid foundation for higher-level math classes.Mark Twain Media Publishing Company specializes in providing engaging supplemental books and decorative resources to complement middle- and upper-grade classrooms. Designed by leading educators, this product line covers a range of subjects including mathematics, sciences, language arts, social studies, history, government, fine arts, and character.