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 system This 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.