The rapid progress of the school in this modern era, so every school always innovates learning so that students do not feel bored and fed up in class, so that student learning outcomes are low. This study aims to find out how much the difference in student learning outcomes by using CTL Learning and those who do not use Contextual Teaching and Learning (CTL) learning in mathematics class III at SD Islam Ar-Rahmat Weragati. This research is a type of quantitative research using experimental methods. Data collection techniques using observation and tests to get the difference between those using and not learning CTL. This study is a population research study, because it took all students in class III at SDI Ar-Rahmat as a sample with 33 subjects. The research data collected were analyzed using the normality test, homogeneity test and t-test. The application of Contextual Teaching and Learning (CTL) learning is expected to provide added value for students in school. The results of this study indicate that there are significant differences between student learning outcomes by using Contextual Teaching and Learning (CTL) learning compared to student learning outcomes using the Group Investigation learning model in grade III Islamic Ar-Rahmat Majalengka Elementary School. Keywords: Effectiveness; Contextual Teaching and Learning (CTL); Learning Outcomes.