Group investigation and rotation trio exchange learning model: The impact on students' mathematical problem-solving abilities

Mathematics is a basic science that has an important role. So, to achieve the objectives of learning mathematics, mathematical problem-solving abilities are needed. The ability students SMP PAB 3 Saintis at Deli Serdang still very low. It suspected Group Investigation and Rotation Trio Exchange models can improve students' abilities. purpose this research was determine effect taught using Exchange. Data collection techniques in use tests. tests carried out were (pretest post-test). data been collected then analyzed validity test, reliability normality homogeneity t-test. Based on results analysis, it found more effective because model had higher outcomes with average score 83.83 compared those which obtained 75.32. Therefore, appropriate be rather than