This paper focuses on using technology to support mathematics instruction. Technologies such as computers and calculators are widely used in the teaching of mathematics. The educators advocate the use of these tools to reduce tiresome computations and tasks so that class time can be more effectively used for learning mathematics. The purpose of this review is twofold: (1) to explore the use of computer and calculator as tools for the mathematics teaching and (2) to analyze their effects on the students' achievement in algebra and calculus. This review of literature from 1990-2006 also addresses the implication of curriculum in an age of computer algebra systems.