• Jeffrey Del Socorro Togni

The study developed and used the researcher–made strategic intervention material (SIM) in Proving Statements on Triangle Congruency named “Power-of-2” as a remediation and supplementary material to improve the mathematics performance of Grade 8 students of Rodriguez National High School, Division of Camarines Sur, school year 2024-2025. This study employed a descriptive–comparative and Research and Development method involving 90 Grade 8 students, forty-five (45) students from each control and experimental group. Data gathering tools include teacher-made tests and evaluation checklists utilizing statistical tools such as mean, standard deviation, proficiency level, weighted mean, t-test for independent samples, t-test for dependent samples, and Cohen's D comparative. The computation was done using statistical software. This study determined the status of the mathematics proficiency of the students on triangle congruency; the design of Power-of-2 strategic intervention material; the curricular validity of Power-of-2 strategic intervention material; the level of the mathematics proficiency of the control and experimental group after using the Power–of–2 strategic intervention material; the significant difference between the mathematics proficiency of the control and experimental group in proving statements on triangle congruency; and the effectiveness of the Power-of-2 strategic intervention material in improving the mathematics proficiency of students in triangle congruency. Results revealed that the status of the mathematics proficiency of Grade 8 students, along proving statements on triangle congruency, did not meet the criterion prescribed by the Department of Education. The design of the Power-of-2 strategic intervention material was suited to the learners and aligned with the competencies prescribed by the Department of Education. The curricular validity of Power-of-2 strategic intervention material in terms of face, content, and construct was very highly valid. The mathematics performance of the experimental and control group did not meet the criterion set as prescribed by the Department of Education, but showed higher mathematics proficiency after the implementation of the SIM and the teaching learning process. There is a significant difference between the mathematics proficiency of the control and experimental groups in the post-test. The Power-of-2 strategic intervention material has a large effect and is effective in improving the mathematics proficiency of the grade 8 students.

Strategic Intervention Material, Learners, Mathematics Proficiency

"Power - of - 2 Strategic Intervention Material in Proving Statements on Triangle Congruency", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.12, Issue 5, page no.k53-k69, May-2025, Available :http://www.jetir.org/papers/JETIR2505A97.pdf

"Power - of - 2 Strategic Intervention Material in Proving Statements on Triangle Congruency", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.12, Issue 5, page no. ppk53-k69, May-2025, Available at : http://www.jetir.org/papers/JETIR2505A97.pdf