This study employs Design Research that aims to develop teaching material in Mathematics in the Modern World (GECMAT) based on the students’ learning styles and mathematics performance during the midterm period of the first semester of the school year 2018 – 2019. The participants of study were the 216 First Year Students taking Bachelor of Science in Industrial Technology of CHMSC major in Architectural and Drafting, Automotive, Fashion & Apparel, Food & Trades, Electronics, Electrical, Refrigeration & Air conditioning and Mechanical Technology, who are officially enrolled in Mathematics in the Modern World. The gathering of data for the study was through the use of two researcher-made questionnaires, namely, the Learning Style Questionnaire (LSQ) and the Performance in Mathematics Questionnaire (PMQ), which underwent validity and reliability. The study reveals that the dominant learning style of the students is visual; however, the second dominant learning style, which is auditory, has the highest mean performance in mathematics. Generally, the student's performance in mathematics was Average when taken as a whole and to the topics Nature of Mathematics, Language of Mathematics, and Data Analysis. However, students' performance in Problem Solving was Low. The audiovideo presentation, practice sheets, and PowerPoint presentation are the teaching materials developed based on the findings. The teaching materials mean values gained excellent acceptability as perceived by the teachers and students. School administrators may influence teachers in promoting an environment favorable for learning and encourage teachers to pay attention to students' diverse learning styles and mathematical performance since these directly impact their mathematical knowledge.

Keywords : Learning Styles, Mathematics Performance and Teaching Materials.