This study aimed to determine the effectivity of the worksheet as remedial materials in teaching Mathematics 10 in terms of components, the level of students? mathematics performance in terms of pretests and posttest, and significant difference in the use of worksheet and students? performance in terms of pretest and posttest. The study employed the descriptive method type of research design. The developed worksheet in Mathematics 10 was evaluated by thirty (30) respondents from twenty-six (26) Grade 10 Mathematics teachers and four (4) master teachers from the public secondary schools in Cluster 3 Division of Laguna covering Pagsanjan, Pila and Santa Cruz specifically. The researcher made a learning activity sheet, which was presented to the thesis adviser for the suggestions, revision, guidelines, and proper construction of instructional materials to test its effectiveness to the performance in mathematics of selected respondents. As a results, the worksheet was given by a remark of extremely valid in all its component?s characteristics such as the objectives, content, examples, assessment, design, clarity, appropriateness, and usefulness. The students showed developing level of performance in their pretest. In the posttest, they showed proficiency level of performance as shown by the computed mean. The result also revealed that there was a significant difference on the use of worksheet and students? performance in Mathematics based on their pretest and posttest. The null hypothesis indicating that there was no significant difference on the use of worksheet and students? performance based on their pretest and posttest was hereby rejected. Rejection of the null hypothesis shows that the worksheet was effective as a remedial material in teaching Mathematics 10 specifically on topics involving permutations, combinations, and probability. The school administrators may encourage teachers to create learning material as a supplementary material that support the needs of learners to have the mastery of the topic. Teachers should adapt the use of worksheet as a remedial material in teaching Mathematics and as part of teaching methodology of the teacher to increase learners? academic performance. Teachers were encouraged to develop worksheet as a remedial material teaching not only in Mathematics but also in other areas of learning. This implies that the crafted worksheet was effective as a remedial material in teaching Mathematics specifically on topics involving permutations, combinations, and probability.

Worksheet

Students' Performance

Remedial Materials

Students' Performance