This book explores the impact of calculators on mathematics instruction in grades K-14. The authors examine underlying theoretical and research information which supports the use of calculators in the mathematics classroom. Chapters examine general issues related to calculator use. Successful calculator projects, while further discussing direction for the future utilization of calculators in mathematics. Many authors contributed articles to this original work, focusing on the benefits of calculators. Authors included are: George W. Bright, Hersholt C. Waxman, Susan E. Williams, Thomas A Romberg, Jane F. Schielack, Clarence J. Dockweiler, Gary C. Bitter, Mary M. Hatfield, Juanita V. Copley, Shwu-Yong L. Huang, Paul A. Kennedy, Bert K. Waits, Franklin Demana, Donald R. LaTorre, and John G. Harvey. Contents: Multiple Perspectives on the Impact of Calculators on the Mathematics Curriculum; Assessment and Technology; Calculator Inservice for Mathematics Teachers; Using the Calculator to Develop Number and Operation Sense, K-Grade 5; The Calculator Project; Assessing School-Wide Impact of Calculator Integration; Research on Calculator Use in Middle School Mathematics Classrooms; The Graphing Calculator in Pre-Algebra Courses; Research and Practice; The Calculator and Computer Precalculus Project (C2PC): What Have We Learned in Ten years?; Supercalculators in Undergraduate Mathematics; Teaching Mathematics with Calculators (TMC): A Local and National Inservice Teacher Education Project; Future Direction of the Study of Calculators in Mathematics Classrooms.