Zulfetriani, Z. 2018. Improving The Student’s Classroom Student’s Reasoning Ability In Mathematics Lesson Through Problem Solving Efforts At Sdn 13 Kubang. Jurnal Ilmiah Pendidikan Scholastic. 1, 2 (Oct. 2018), 149–158. DOI:https://doi.org/10.36057/jips.v1i2.257.