Torang Siregar, Ahmad Arisman, Iskandarsyah, Risky Ardian and Awal Harahap 2023. Research And Developing Mathematics Knowledge Child Development Perspectives, 2022. Elementaria: Journal of Educational Research. 1, 2 (Dec. 2023), 65–76. DOI:https://doi.org/10.61166/elm.v1i2.11.