This study was designed to investigate the effectiveness of GeoGebra instructional package on students’ performance in secondary school mathematics. Six research questions and six null hypotheses were formulated. The research design was quasi experimental, specifically the pre –test, post-test non-randomized control groups design was used. A total of 500 students from six out of the 85 public secondary schools in Akwa Ibom North West Senatorial District, with student’s population of 361,486 students were used for the study. Intact classes were used as experimental and control groups in each of the six schools. Mathematics Achievement Test consisting of 50 items multiple choice items developed by the researcher was used as instrument for data collection and was validated by experts and the Kuder Richardson’s formula 21 (KR-21), reliability coefficient was 0.89. The GeoGebra Software and demonstration method lesson plans were used as instructional tools for the study. Results were analyzed using mean, standard deviation and ANCOVA. From the findings, it was observed that GeoGebra Mathematics software enhanced more and significantly the performances of students in Mathematics than demonstration method in Akwa Ibom state. It is recommended that the use of GeoGebra should be used as a viable alternative or supplement to demonstration method of teaching in Akwa Ibom State.
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