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This study aims to: 1) To describe the mathematical communication skills of students who gain learning model of problem based learning and students who obtain conventional learning; 2) To describe the ability of mathematical creativity of students who get problem based learning model and students who obtain conventional learning; 3) Describe the interaction between the early ability of mathematics with learning to improve students mathematical communication skills; and 4) Describe the interaction between the early ability of mathematics with learning to improve students mathematical creativity. This research is a quasiexperimental research. The population of this study were students the sample in the study were students of class VIII. Statistical analysis of data was done by analysis of 2-way variance (ANAVA 2 Path). The results showed that: 1) Improvement of students mathematical communication skills taught by learning of problem based learning was significantly higher compared to students taught by conventional learning; 2) Improvement of students mathematical creativity skills taught by learning of problem based learning is significantly higher compared to students taught by conventional learning; 3) There is no interaction between early ability of mathematics and learning model to improve students mathematical communication ability; and 4) There is no interaction between the early ability of mathematics and the learning model to improve students mathematical creativity abilities