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Abstract
The purpose of this study was to determine the description of the thinking process in situation modeling in solving real-life mathematical problems. This type of research is qualitative with a case study design. The subjects of the study were fifth grade students of SD No. 1 Bhaktiseraga. Data on students' abilities in situation modeling in solving real-life mathematical problems were collected by essay tests and interviews. Furthermore, the data were analyzed using descriptive statistics. The results showed that the average overall student score of the three problems was 75.57 and this was categorized as good. In general, students' situation modeling abilities for problem number 1 were very good, problem number 2 was categorized as good, and problem number 3 was categorized as sufficient. Students' abilities in situation modeling for problem number 1 were very good at 55.74%, and good at 44.26%. Students' abilities in situation modeling for problem number 2 were very good at 42.62%, and good at 57.38%. For problem number 3, the students' situation modeling ability is very good at 11.48%, good at 47.54%, sufficient at 3.28%, not good at 4.92%, and very bad at 32.78%. There are several situation modeling strategies used by students as a form of their thinking process. In problem 1, the strategy used is division. In problem 2, students use the addition strategy as a result of their thinking process, while in problem 3, students use the addition strategy, but many students are still unable to determine the situation modeling.