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This study aims to determine the effect of the application of Problem Based Learning model (PBL) assisted Adobe Flash CS5 reviewed from the ability of mathematical reasoning on student achievement. The research design used in this research is Quasi Experimental Design with factorial 2 × 3. Sampling by Cluster Random Sampling technique. The population in this research is all students of class VIII in Ma'had Islam Semarang Junior High. Data processing is done by using anova calculation of two different cell paths followed by scheffe test to know the big influence. The conclusions of the results of data processing are 1) Student achievement using Problem Based Learning model is better than students using conventional learning model. 2) There are differences in student achievement between students who gain high, medium, low reasoning ability. 3) There is no interaction between Problem Based Learning model and conventional on each level of reasoning ability to student's mathematical learning achievement.
Keywords: PBL, Adobe Flash CS5, Ability of Reasoning, Student Mathematical Learning Achievement.