This research aims to determine the effect of using PhET Simulation media on learning outcomes in mathematics subjects at SD Negeri 69 Palembang. This research uses an experimental method with a True Experimental design "posttest - Only Control Group" with a sample of 47 people. The sampling method in this research was taken using a total sampling technique where each member of the population was used as a sample. The data collection technique in this research uses tests, while the data analysis technique uses normality tests, homogeneity tests and hypothesis tests. Based on the data from the research that has been carried out, it can be proven from the results of the posttest in the experimental class which was given treatment using PhET Simulation media, it was found that the significant value was 0.005 which was smaller than alpha (α) = 0.05 with a calculated t value > t table or 2,935 > 2,014. This means that Ho is rejected and Ha is accepted, so it can be concluded that there is an effect of using PhET Simulation media on learning outcomes in mathematics subjects after being given treatment in the experimental class using PhET Simulation media and the control class using conventional learning. This means that Ho is rejected and Ha is accepted, So it can be concluded that there is an influence of the use of PHET simulation media on learning outcomes in mathematics subjects at State Elementary School 69 Palembang.
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