The use of instructional media is an essential component of teaching-learning process which contributes to the efficiency as well as effectiveness of the teaching-learning process. Computer-supported instruction has a very important role to play as an advanced technological instruction as it employs different instructional techniques like powerpoint presentations, video presentations etc. The use of computers in the classroom encourages active learning and meets the diverse needs of the learners through the use of technology in education. Dyscalculia is a learning disorder in which pupils face severe difficulties in performing mathematical computations. Innovative use of computer technology may help dyscalculics to overcome their disability to a large extent. Research studies (Lugo, 2004; Mohankumar & Rajaguru, 2001; Calhoon, 1999; Nwaizu & Ifeanyi, 1990) reveal how multimedia computer technology could be effectively used as a potential supplemental teaching aid rather than traditional classroom instruction. The present investigation examined the effectiveness of using computers for teaching mathematics to dyscalculic children. The Pre-test Post-test Equivalent Group Experimental Design was followed for conducting the study. The sample comprised of 20 dyscalculic students at the primary level each for the experimental group and the control group. The tool used was an achievement test in mathematics prepared by the investigators. "t" test for independent group was employed for the analysis of data. The results of the study indicated that computer-supported instruction enhanced the mathematical ability and academic performance of dyscalculic children.