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This research based on the importance of the students reasoning ability should be possessed. One of the learning models are conceptually possible can improve the reasoning ability is the problem based learning model. This research aims to determine the implementation of problem based learning toward students reasoning ability, viewed by students learning motivation on chapter contamination, destruction and risk the environment in class XI Social Senior High School 2 Semarang, Central Java, Indonesia. Learning motivation of this research is the moderator variable with consideration that motivation is one of the factors that are conceptually influence a learning results. This research is a quasi-experimental with factorial design 3×2. The technique of data collection was done with ability reasoning test, motivation questionnaire, and observation of learning. Technique of data analysis using statistical T test and ANOVA with SPSS version 20.0 for windows. The results showed that 1) there are differences in students reasoning ability of students in the class that use and do not use the problem based learning model, 2 there is an increased geography learning motivation significantly after using problem based learning, 3) there was no interaction between the learning motivation toward students reasoning ability.

The Implementation of Problem Based Learning toward Students’ Reasoning Ability and Geography Learning Motivation