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This study is based on the importance of elementary student-s mathematical connection and communication. The aim of this study was to find out the student-s ability to apply mathematical concepts on problems that arise in each learning. The study design used was descriptive qualitative. The samples in this study were 22 fourth grade students of an elementary school in Subang. This study uses mathematical connection ability tests instrument and a mathematical communication ability tests instrument. The results obtained that students in answering the mathematical connection ability tests and mathematical communication test still low. Some students difficult and confuse when answering test because students do not understand the purpose of the question. Based on these problems, learning will be further developed so that mathematical connection and mathematical communication ability can be improved again.