Qudwatullathifah, R.N., Suyitno, H. and Ridlo, S. 2019. Students’ Problem Solving Ability Based on the Fraction Concept Mastery in the PBL Model. Journal of Primary Education. 8, 8 (Oct. 2019), 207-214. DOI:https://doi.org/10.15294/jpe.v10i2.34451.