Effectiveness of Tri-In-1 Strategic Intervention Materials For Grade 9 Students Through Solomon Four-Group Design

Mathematics, as a highly sophisticated yet practical discipline, provides a person with opportunities to develop life and practical skills. Learning its concepts becomes easier with the aid of various instructional materials (IMs) which are necessary for the teaching-learning process since they address the diverse needs of learners. Strategic Intervention Material (SIM) is a user-friendly IM that can be answered solely by a student or by a group of students inside or outside the classroom. This study determined the effectiveness of the developed Tri-in-1 SIM for grade 9 Mathematics through Solomon Four- Group Design using a total of 60 subject participants that underwent matching under the quasi- experimental method of research. The SIM is incorporated with two-dimensional manipulatives and is composed of different activity cards about the parts of a right triangle, proportions of the corresponding parts of similar triangles, geometric mean in a right triangle and word problems involving right triangle similarity theorem. The study revealed that when students are exposed to Tri-in-1 SIM, their Mathematics achievements are better and higher (F=46.306, P<0.05). Tri-in-1 SIM is more effective in teaching right triangles than using the Mathematics Learner’s Material 9. Another SIM with two- dimensional manipulatives entitled Make It Right is proposed for the next lessons. IMs that are tailored based on the actual students’ aptitude could be more effective than the materials that are designed for the national level. Teachers are encouraged to make SIM with two-dimensional manipulatives that suit their students’ learning ability to elicit utmost academic performances.

Keywords: effectiveness, strategic intervention material (SIM), Solomon Four-Group Design, instructional material (IM), manipulatives