The following study aims at investigating which subject-specific words students in year 6 find difficult in the mathematical field of geometry and which strategies they use in spite of difficulties to be able to take on mathematical tasks in geometry. To achieve the purpose of the study, two questions have been formulated: What mathematical terms in geometry do grade 6 students find difficult to master? and What strategies do math students use to solve problems despite a possible lack of understanding of the terminology? To answer the questions, both quantitative and qualitative methods have been used in terms of a survey and of interviews with year 6 students. The result of this study shows what some words that students find difficult to master in geometry are: line of symmetry / lines of symmetry, diagonal and origin and symmetrical. When systematizing the terms into categories, it was clarified that the students in year 6 find words used for description of properties in geometry most difficult to master. The three most mentioned strategies pupils use when they do not understand the mathematics terms are to ask a teacher, guess and use image support (if available).