Matematical communication skill is an essential component and should be accomplished in mathematics learning. The observation results indicate that the mathematical communication skill of the students in SMPN 7 Padang was still low. Therefore, a research was carried out in order to improve students’ mathematical communication skill by adjusting the Think Talk Write and Mind Mapping (TTW-MM) cooperative learning model. The kind of research was quasy experimental and descriptive with Randomized Control-Group Only Design. Based on the research, it was concluded that the development of mathematical communication skill of students whose during learning process using TTW-MM model has increased, and mathematical communication skill of students whose learning process using TTW-MM model was better than mathematical communication skill of students whose learning with conventional learning. Keywords — Mathematical Communication Skills, Cooperative Learning Model, Think Talk Write, Mind Mapping
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