Book excerpt: The Assessment Prep for Common Core Mathematics series is designed to help students in grades 6 through 8 acquire the skills and practice the strategies needed to successfully perform on Common Core State Standards assessments. Covers geometry, ratios and proportional relationships, the number system, expressions and equations, and statistics and probability. Each book includes test-taking strategies for multiple-choice questions, test-taking strategies for open-ended questions, and answers and diagnostics. Mark Twain Media Publishing Company specializes in providing captivating, supplemental books and decorative resources to complement middle- and upper-grade classrooms. Designed by leading educators, the product line covers a range of subjects including mathematics, sciences, language arts, social studies, history, government, fine arts, and character.