Technology integration in mathematics classrooms is important to the field of education, not only because today's society is becoming more and more advanced and reliant upon technology but also because schools are beginning to embrace technology as an essential part of their curricula. The Principles and Standards for School Mathematics (National Council of Teachers of Mathematics [NCTM], 2000) and the National Educational Technology Standards (International Society of Technology in Education [ISTE], 2005) for both teachers and students emphasize the importance of technology in teaching and learning for K-12. There is a variety of technologies integrated into mathematics classrooms that support different teaching and learning strategies and objectives. This article discusses the educational technologies used in K-12 mathematics classrooms and their effects on instruction and student learning. (Contains 1 figure.)