Effect of Instructional Materials on Academic Achievement in Mensuration among Senior Secondary Students in Dutsin-Ma Education Zone, Katsina State

Abstract This study examined the effect of instructional materials on the academic achievement of senior secondary school students in mensuration within the Dutsin-Ma Education Zone, Katsina State. A total of 210 out of 4,129 public senior secondary two (SS II) Mathematics students during the 2023/2024 academic session in Dutsin-Ma Education Zone, Katsina State were randomly selected. A specially constructed and validated test, "Students' Mensuration Achievement Test (SMAT)," with reliability coefficient of 0.83 was used to collect data. Data collected was analyzed through descriptive statistics for research questions and t-test to test hypotheses at a 0.05 significance level. Results indicated that students taught with instructional materials performed significantly better than those without, with no notable gender difference in achievement. Recommendations include supplying instructional materials to enhance mathematics teaching in Katsina State. Keywords: Instructional materials, Achievement, Gender, Mathematics, Mensuration.