ISSN: 2782-893X
eISSN: 2799-0664
DepEd Order No. 16, s. 2012 emphasize Mother Tongue-Based Multilingual Education (MTB-MLE) to be taught in the Key Stage 1 classes as a subject and as a medium of instruction except for the English and Filipino subjects. Thus, teaching Mathematics uses mother tongue as medium of instruction. With this premise, the researcher decided to come up with a study to determine the effectiveness of mother tongue-based as medium of instruction in teaching Mathematics in Grade 1 classes. Utilizing the quasi-experimental research design for an in-depth analysis of the study, the researcher used a researcher-made Mathematics test questions in the 1st quarter Most Essential Learning Competencies (MELCs). Simple percentage and t-test of mean difference were the statistical tools used. Results of the study revealed a significant difference in the performance of the Grade 1 pupils in Mathematics before and after the exposure of mother tongue-based instruction in teaching the subject. Exposing the pupils to their mother tongue and providing activities which can be understood by the pupils greatly influence for an improved performance. Thus, mother tongue-based is an effective medium of instruction in teaching and learning Mathematics.