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The problem in this study is: "Is there a difference in mathematical understanding abilities of students who get the Problem Based Learning model with Project Based Learning models. The purpose of this study was to determine the differences in mathematical comprehension abilities between students who learned using the Problem Based Learning model and those using the Project Based Learning model. The benefits of this research for students are expected to be able to provide additional mathematics learning and serve as one of the inputs to select and develop appropriate learning models, pig researchers themselves are expected to provide an original description in the field regarding the implementation of the model applied in research. In this study, the type of research used is class research with group design The Grouppretest-Postest Desing Statics. The population in this study were students of SMPN 1 Bayongbong and the samples in this study were students of class VII-A and VII-D SMP 1 Bayongbong .. the instruments used consisted of: tests of mathematical comprehension skills and attitude scale based on Likert scale. The instrument was declared to have fulfilled the criteria for a good instrument to meet validity, reliability, differentiation, and difficulty. Data analysis was performed using the normality test, the homogeneous test of two variances, t-test and t-test. The results of this study indicate that there is no difference in the ability of mathematical understanding between the Problem Based Learning model and Project Based Learning models. The attitude of students towards mathematics learning with Problem Based Learning shows a good attitude. The attitude of students towards learning mathematics with Project Based Learning shows a very good attitude