Novitasari, F. and Walid, W. 2022. Development of Android-Based Linear Program Teaching Materials with an Ethnomatematics Approach to Improve Students’ Mathematical Problem Solving Ability. Unnes Journal of Mathematics Education. 11, 1 (Mar. 2022), 1-11. DOI:https://doi.org/10.15294/ujme.v11i1.55806.