This study investigated the efficacy of adapted teaching materials on mathematics performance for primary school pupils with visual impairments in Kano and Katsina states, Northwest, Nigeria. Four objectives, hypotheses and research questions were formulated each, to guide the study. The design of the study was experimental research of the pre-test post- test two treatment groups design. The total population for the study was one hundred and fifty (150), while the sample size was sixteen (16). Purposive sampling was used in selecting the sample, data was collected using researcher design mathematics achievement test for primary 3 pupils with visual impairment titled “Jaw achievement test”. The validity of the test was determined by content validity as the test items were extracted from UBEC approved school textbook, while the reliability was determined through test re-test reliability and calculation of Cronbach alpha co-efficient whose result was 0.78. The test was administered and marked before and after intervention, the results were analyzed using independent samples t-test and paired sample statistics. It was found out that both the experimental groups of Kano and Katsina were at the same level of performance before the intervention, and both groups performed better and scored higher marks in the post-test than the pre-test. The study had developed adapted teaching materials that can be used for teaching pupils with visual impairments in learning mathematics and developed an achievement test. Recommendations given from the study include teachers of pupils with visual impairment should be adapting teaching materials for better learning outcomes, special education teacher training institutions should introduce or improve courses that would equip would-be teachers with skills that would enable them to learn how to adapt and develop teaching materials from simple local resources.

Keywords: Efficacy, Adapted teaching materials, Mathematics performance, Visual impairment.