Cahyo, A.D. and Dirgantoro, K.P.S. 2026. Implementation of Missouri Mathematics Project in Reducing Students’ Mathematical Errors of Class VII-4 Based on Kastolan Theory. EduMatSains : Jurnal Pendidikan, Matematika dan Sains. 11, 2 (Oct. 2026), 56–77. DOI:https://doi.org/10.33541/edumatsains.v11i2.8340.