**Improved Mathematics Learning Outcomes through Cooperative Type Learning Model CORE in Teaching Student Association VII Class SMP Negeri 25 West Poleang**

**ABSTRACT**

** ^{1}**Rismawati

**Subawo, Made**

^{2}**Herlina**

^{3}This research is an experimental research with the aim to megetah (1) the result of learning mathematics of the seventh grade students of SMP Negeri 25 West Poleang before being taught by using cooperative learning model of CORE type in teaching of set; (2) the result of learning mathematics of VII students of SMP Negeri 25 West Poleang after being taught by using cooperative learning model of CORE type in teaching of set; (3) whether there is an improvement of mathematics learning outcomes of students after being taught using cooperative learning model of CORE type in teaching of set. The hypothesis in this research is that there is an improvement of mathematics learning outcomes of students after being taught by using cooperative learning model of CORE type in the teaching of class VII students of SMP Negeri 25 Poleang Barat.

The population in this study is all students of class VII with the number of 22 people. Sampling is done by using saturated sampling where taken as an experimental class. The sample of the research is the students of class VII with the number of 22 people. Data retrieval is done by means of learning result test which then used to obtain data on student learning result of mathematics. Data analysis techniques use descriptive statistics and inferential statistics. The result of inferential research using one sample t-test has obtained t_{count} = 8,116 on the sig. = 0,000 <α = 0.05 indicates that H_{0} is rejected and H_{1} is accepted, inferentially this means that there is a significant difference between the mathematics learning outcomes of students after being taught by cooperative learning model type CORE and before being taught by cooperative learning model of CORE type. From the results of this study can be concluded that there is an increase in student learning outcomes after learning taught using cooperative learning model type CORE in teaching the set of students of class VII SMP Negeri 25 West Poleang.

**Keywords:** Effectiveness, CORE type cooperative learning model, Mathematics learning outcomes.