Carlos Alberto Paragua Macuri , Melissa Gabriela Paragua Macuri , Melecio Paragua Morales , Nicéforo Bustamante Paulino. Basic operations with rational numbers and didactic mediation of the place value board in first grade students in Huánuco. JICRCR [Internet]. 2024 Aug. 22 [cited 2025 Dec. 7];:372-8. Available from: http://jicrcr.com/index.php/jicrcr/article/view/732