This study aims to determine the increase in learning outcomes of mathematicsin class VIII B students of Belibis Catholic Middle School Makassar through the cooperative model Numbered Head Together type on the subject of flat sided space builds. TypeThis research is Classroom Action Research (CAR). Subject of this researchare students of class VIII B Belibis Catholic Middle School Makassar 2022/2023 which consists ofof 21 students. There are several data collection techniques used, namely learning achievement tests , teacher activity observation sheets, and activity observation sheetsstudent. The data analysis technique used is the quantitative data analysis technique And qualitative. Findings from research This show that with use model learning cooperative type Numbered heads together can increase results learning mathematics in students. Matter This can seen in cycle I obtained an average value of 59.76 with a standard deviation of 15.297 with pass rate of 14.28% and in cycle II increased to 85.71% with average 81.05 with a standard deviation of 6.078 based on the assessment category used, scores of students' mathematics learning outcomes in cycle I were categorized In total there were 3 people students and on cycles II to 18 people student. From the research results obtained, it can be concluded that whether by applying model learning cooperative type Numbered heads together can increase results Study mathematics on student class VIIIB JUNIOR HIGH SCHOOL Catholic Grouse Makassar.

Saykey: Results Study, Model Learning, Model cooperative Type Numbered heads together