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This research aims to find out if learning models Numbered Head Together assisted media Prezi than conventional learning model. As well as to find out the relationship between the liveliness of the students with learning models Numbered Heads Together a media-assisted problem solving ability against Prezi mathematically students. This research was Quasi Experiment. The population in this study are students at Muhammadiyah Semarang 08 JUNIOR HIGH SCHOOL. Samples taken with the cluster random sampling techniques. Based on the analysis of the calculation of the difference of ability obtained troubleshooting class with students on mathematical models of learning Numbered Heads Together berbantu Prezi and conventional media. The t-test with one party obtained an average of mathematical problem-solving ability of the students in the class Numbered Heads Together berbantu media Prezi is better than conventional class with thitung > ttabel i.e. 2,335 > 1,71. The calculation of Simple Linear regression test obtained a positive relationship between the liveliness with models Numbered Heads Together berbantu media Prezi mathematical problem solving ability against students of 56.03%.
Keywords: Numbered Heads Together, Prezi, and problem solving.