The purpose of the study was to develop a Social-Media Based Mathematics Instructional Module (SMBMIM) for Grade 7 students. Specifically, it answered the questions: 1) what are the desirable characteristics of the module in terms of validity and reliability; 2) what are the pre-delivery appropriateness of the SMBMIM in terms of learning objectives, lesson content, language used, and evaluation activities; and (3) what is the educational use of the SMBMIM in meeting the learning competencies of students in Mathematics as revealed in their Pre-Post-test results?

The process of module development was anchored on ADDIE Model by McGriff (2000). The validity of the module was determined using Kappa statistics with Pairwise Agreement, while Cronbach’s alpha was used to determine the module’s reliability and pre-delivery appropriateness. In terms of educational use, the learning gains of students measured in terms of Pretest and Post-test scores for every learning competency was used as indicator for the variable module use.

Findings show that the SMBMIM is valid, reliable and effective for use as instructional material. However, it is recommended that a further study be done adopting a quasi-experimental method to further validate the effectiveness of the developed module as an instructional tool in meeting the Grade 7 Mathematics learning competencies.