THE VAN HIELE MODEL IN COMPETITION SOLVES PROBLEMS OF SHAPE, MOVEMENT AND LOCATION IN FIRST-GRADE STUDENTS OF SECONDARY EDUCATION OF A STATE EDUCATIONAL INSTITUTION . LEX [Internet]. 2025 Oct. 19 [cited 2026 Aug. 14];23(S6):714-27. Available from: https://lex-localis.org/index.php/LexLocalis/article/view/801850