THE IMPLEMENTATION OF COOPERATIVE LEARNING MODEL STAD TYPE TO IMPROVE STUDENTS’ PROBLEM SOLVING ABILITY IN CLASS VII SMP NEGERI 37 MEDAN

This study aimed to evaluate the effectiveness of applying the cooperative learning model STAD type in enhancing students' mathematical problem-solving ability in data presentation materials. The research was conducted at SMP Negeri 37 Medan through a class action research. The research instruments used included problem-solving ability tests and observation sheets. By analyzing problem-solving
ability test results and observation results, the study discovered that implementing the cooperative learning model STAD type had a significant positive impact on students' mathematical problem-solving abilities. This was demonstrated by the increase in the average score of students' problem-solving ability tests, as well as the classical completeness from cycle I to cycle III. Specifically, students' average scores rose from 51.09 in cycle I to 73.54 in cycle II and 83.48 in cycle III. The implementation of the cooperative learning model STAD type resulted in an increase in classical completeness among the
students. The percentage of classical completeness after cycle I was 26%, 65% after cycle II and 90% after cycle III. The observation results also showed improvement, 72% after cycle I, 82% after cycle II, and 90% after cycle III.