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Learning math vocabularly is essential for language development and improving students' mathematics knowledge. The present research is descriptive-analytical, its purpose is applied and its approach is qualitative. First, by synthesis method, the researches done in the field of teaching mathematical vocabulary were reviewed and the types of words that need to be taught were categorized. Then, using content analysis method, the key words of math books were extracted. The sample of the research is the first to third grade elementary mathematics textbooks of Iran. In the synthesis section, the research community of all articles related to the teaching of mathematical vocabulary and the research sample, 36 articles are available, which were selected by searching the selected internal and external databases. The words extracted from the first to third grade elementary math textbooks were placed in eleven categories.