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Numbered Heads Together is a coperative strategy that can improve student’s mathematical communication ability. Mathematical communication is one of the mathematics’ standard process that must be mastered by students. The purpose of this study is to determine whether students’ mathematical communication ability through Numbered Heads Together combined with inductive and deductive approach is better than students’ mathematical communication ability taught by expository method. This study is a quasi-experimental research using non-equivalent control group design. Two classes was taken as sample. The first class is called the experimental class and the second class is called the control class with the number of students in each class is 35 students. Measurement instrument using essay test. Based on data analysis, the average of students' mathematical communication ability increased by 1.457 for the experimental class and 0.832 for the control class. The result of t-test analysis shows that tcount is greater than ttable. This means that H0 refused and Ha accepted so students’ mathematical communication ability who were taught by Numbered Heads Together combined inductive and deductive approach is better than students’ mathematical communication. Keywords—mathematical communication; deductive inductive approach; expository method

The Difference of Students' Ability on Mathematics Communication Through Numbered Heads Together Combined with Inductive Deductive Approach and Expository Method