Purwati, G.A.M., Sudana, D.N. and Arini, N.W. 2021. Mathematics Learning with Guided Inquiry Model Open-Oriented Problem Solving Improves Student Learning Outcomes. International Journal of Elementary Education. 4, 4 (Mar. 2021), 454–463. DOI:https://doi.org/10.23887/ijee.v4i4.27198.