The K-12 curriculum which aimed to enhance the quality of basic education in the Philippines is a welcome development in our system of education in the country. The transfer of knowledge to the students is more effective if the learning materials are suited to the needs and abilities. This will only be achieved if the teacher can develop effective instructional materials for the students. With these perspective, the researcher decided to validate a K to 12 based supplemental worktext in Araling Panlipunan 9 of Tanza National Comprehensive High School for the year -2016-2017.
The obtained T-value of 58.63 from pre- test results is higher than the critical value of 1.960 at 0.05 level of significance was interpreted significant. This implies that the supplementary worktext instructional material is a great help in teaching Araling Panlipunan for Grade. There is a need to produce additional materials in Teaching Araling Panlipunan for Grade parallel to the K-12 curriculum.
Keywords: K – 12 Curriculum, Instructional Learning Materials