Manuel S. Enverga Institute Foundation, Inc. (Formerly Luzonian High School) San Antonio, Quezon Tel. No. 042 – 795 – 60 – 93 February 15, 2024 Ricardo L. De Guzman Principal I San Antonio National High School Sampaguita San Antonio, Quezon Sir; Greetings of peace and joy! I am writing to express my enthusiastic endorsement of the research project titled "Development of Localized Manipulative Intervention Materials and its Acceptability among Public Secondary Math Teachers," conducted by the BSED Mathematics students from Manuel S. Enverga Institute Foundation, Inc. The research project focuses on developing localized manipulative intervention materials, including mathematics TIC TAC TOE and TANGRAMS. These tools offer hands-on, interactive learning opportunities in mathematics classrooms, catering to diverse learning styles and potentially enhancing the teaching and learning experience significantly. I wholeheartedly endorse the proposed research project and offer my support for its successful execution. Should you require any further assistance or collaboration, please do not hesitate to reach out. Sincerely, Cristopher M. De Ocampo, Ph.D Research Writing Professor Edelyn L. Quizon Researcher Noted: Joseph G. Quizon, LPT, MAEd Research Adviser Approved: Ricardo L. De Guzman Principal I Mhel Joshua I. Roxas Researcher Noriel C. Din Researcher Manuel S. Enverga Institute Foundation, Inc. (Formerly Luzonian High School) San Antonio, Quezon Tel. No. 042 – 795 – 60 – 93