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The competence of mathematical communication skill is one of the main factors in learning Mathematics; however, the reality in learning mathematics shows that the students’ ability of mathematical communication is still low. The main issues of this study is to analyse the students 'mathematical communication skills using The Learning Cell model and expository learning and to analyze the effect of the application of The Learning Cell model on students' mathematical communication skills. The research method used was a quasi-experimental method with research design of Two Group Randomized Subject Post-Test Only. To know the effect of The Learning Cell model's treatment of mathematical communication skills used Effect Size formula. The total sample was 87 students consisted of 44 students of experimental group and 43 students of control group. The technique of data collection for students' mathematical communication skills used the test instrument on the sub-subject of building a flat side space. The results show that the students’ mathematical communication skills are taught with The Learning Cell model is higher than the students' mathematical communication skills with those who taught with expository learning and the Effect Size is in the medium category. The indicators of mathematical communication skills in this research are: (1) representing real objects, drawing diagrams or tables in the form of ideas and mathematical symbols, (2) explaining ideas, situations and mathematical relations in writing using real objects, images, and algebraic expressions, (3) declare everyday events in language or mathematical symbols or arrange mathematical models of events. So, The Learning Cell model is one of mathematics learning that can be used to improve the students' mathematical communication skills.

The Effect of The Learning Cell Model on Studentsr Mathematical Communication Skills