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Abstract: The purpose of this study was to determine if the use of supplementary materials was effective in improving the academic performance of Grade 3 struggling learners in Mathematics 3 at San Vicente Elementary School, Glan 2 Division of Sarangani Province for the school year 2021-2022. This study used the pre-experimental design. Specifically, the researcher utilized the single group pre-test-posttest design. The respondents were the 30 grade 3 struggling learners in Mathematics of San Vicente Elementary School Glan 2 District, Division of Sarangani composed of 15 boys and 15 girls, respectively. The statistical tools used to analyze and interpret the data gathered were the frequency counts, mean, and t-test to treat the relationship of the two variables under study. Based on the findings, it was found out that the supplementary materials were effective and had improved the performance of Grade 3 struggling learners in Mathematics. Keywords: Supplementary materials, Mathematics 3, pre-experimental design, education, Philippines. Title: EFFECTIVENESS OF SUPPLEMENTARY MATERIALS IN MATHEMATICS 3 IN SAN VICENTE ELEMENTARY SCHOOL Author: DELY B. BESANA, JOHNNY S. BANTULO, LYNDON QUINES International Journal of Recent Research in Thesis and Dissertation (IJRRTD) Vol. 3, Issue 2, July 2022 - December 2022 Page No: 110-130 Paper Publications Website: www.paperpublications.org Published Date: 15-September-2022 DOI: https://doi.org/10.5281/zenodo.7082477 Paper Download Link (Source) https://www.paperpublications.org/upload/book/EFFECTIVENESS%20OF%20SUPPLEMENTARY-15092022-6.pdf

International Journal of Recent Research in Thesis and Dissertation (IJRRTD), Vol. 3, Issue 2, July 2022 - December 2022, Paper Publications, Website: www.paperpublications.org