Amreta, M.Y. et al. 2025. Calbox Jurang: A Concrete Learning Tool to Enhance Numeracy in Grade 1 Mathematics. Prisma Sains : Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram. 13, 3 (Jul. 2025). DOI:https://doi.org/10.33394/j-ps.v13i3.15974.