The study was designed to see the effect of CAI as a strategy on the academic achievement of senior high school (SHS) students in the subject area of mathematics. The sampled classes were assigned to two groups on the basis of their achievement scores in the pre-test. Two different treatments were applied during the study. The experimental group received instruction via CAI with the researcher as a facilitator while the control group was taught by the researcher using the conventional approach. Both groups took an achievement test just after the treatment was over to determine the treatment effect. Analysis of data revealed that both the CAI and the traditional approach have led to increase in students’ performance in the teaching and learning of Pie Chart and Histogram in Core Mathematics but the CAI approach has led to much gain in terms of students’ achievement than the traditional approach in the teaching and learning of Pie Chart and Histogram in Core Mathematics. It was concluded that the CAI was equally effective for the students in the experimental group because it helped students to develop Mathematical concepts adequately with limited teacher guidance
Keywords: Computer Assisted Instruction (CAI), Experimental Group, Traditional Method., control group