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The purpose of this study was to determine the influence in elementary school mathematical reasoning in geometry problems solving. This research method uses quantitative research with a type of comparative descriptive research. The subjects used were 5th grade students at SD Negeri Tegalmulyo, Yogyakarta City. This study used the Univariate test on the General Linear Model, with the help of data processing program Statistics Package for Social Sciences (SPSS) 16.0 for Windows. The results of data analysis obtained the Sig. equal to 0.002 with a significance level of 95% or  (alpha) = 0.05 hypothesis testing. Thus it can be interpreted that there is an influence of mathematical reasoning of 5th grade elementary school students in solving geometry problems on mathematics subjects. This is explained by the existence of mathematical competencies in students different reasoning. Mathematics competency on the highest reasoning of students mastered by students is able to describe various characteristics of the problem by mentioning the solutions used, while for the lowest are students with the ability to incorrectly mention the solution to the problem and process in solving mathematical problems.