The purpose of this study was to analyze the effect of the application of the PBL (Problem bassed Learning) on the ability of reasoning. The method used in this study was Quasi Experimental Design. The population in this study is all students of class X in one of the SMAN have accreditation A in Kuningan District Year 2016/2017 School of 195 students. Sampling was conducted using cluster random sampling technique, divided into two groups, namely grade class model of PBL (Problem bassed Learning) class of 39 students and discussion method 39 students. The instrument used in this research is the test description of students' deployment ability, student questionnaire and observation sheet. Hypothesis testing using parametric statistical tests in this case to test the hypothesis that the effect of the application of the model-assisted PBL multirepresentasi against reasoning abilities using the t test obtained that _t> t _table is 3.63> 2.67, which means there is a good influence on the implementation of the model PBL (Problem bassed Learning) who assisted multirepresentasi against reasoning ability of students to the concept of environmental pollution. Therefore it can be concluded that the students reasoning ability is increased when used models multirepresentasi PBL assisted in the learning process.

Abidin, Yunus. 2014. Desain Sistem Pembelajaran dalam Konteks Kurikulum 2013. Bandung : Refika Aditama.

Agustin, Dudeliani, Juwita. 2014. “Penerapan Model Pembelajaran Berbasis Masalah (PBM) Disertai Lks Berbasis Multirepresentasi Pada Pembelajaran IPA-Fisika di SMP”. [Online]. Skripsi FKIP Universitas Jember. Tersedia : http://fisika.fkip.unej.ac.id Diakses pada tanggal 11 Januari 2017

Ainsworth, Shaaron E. and Van Labeke, Nicolas (2004). “Multiple forms of dynamic representation”. Learning and Instruction. [online]. Tersedia : http://citeseerx.ist.psu.edu/viewdoc/dow nload.pdf Diakses:8 Februari 2017

Herman, Tatang. 2007. “Pembelajaran Berbasis Masalah Untuk Meningkatkan Kempuan Penalaran Matematis Siswa SMP”. [Online]. Jurnal Cakrawala Pendidikan : Februari 2007, th XXXVI No. 1. Tersedia:http://eprints.uny.ac.id/389/1/pembelajaran_berbasis_masalah.pdf. Diakses pada 23 mei 2017

Ismet, Basuki dan Hariyanto. 2014. ASESMEN PEMBELAJARAN. Bandung : Remaja Rosdakarya.

Magsino, M. Richard. 2014. “Enhancing Higher Order Thinking Skills in a Marine Biology Class through Problem-Based Learning”. [Online]. Asis Pasific Journal of Multidisciplinary Reasearch. P-ISSN 2350-7756, Volume 2 No. 5 E-ISSN 2350-8442. Tersedia : www.apjmr.com. Diakses pada Tanggal 23 Mei 2017

Marzano, R. J., Debra, P., & Jay, M. (1993). Assessing Students Outcomes, Performance Assessment Using the Dimensions of Learning Model. Alexandria, Virginia USA: Association for Supervision and Curriculum Development [online]. Tersedia : thhp://ascd.org/book Diakses 7 Februari 2017

Sugiyono. 2015. Metode Penelitian Pendidikan : Pendekatan Kuantitatif, Kualitatif dan R&D. Bandung : Alfabeta.

Widianti Fitri N, Budi Martiyasa dan Ariyanto. 2012. “Upaya Meningkatkan Kemampuan Penalaran Matematis Siswa Melalui Model Pembelajaran CORE (Connecting,Organizing, Reflecting, Extending)”. [Online]. Jurnal Matematika. Tersedia : http://eprints.uny.ac.id/19613/9/2_Naskah_Publikasi_CORE.pdf. Diakses pada tanggal 23 Mei 2017

Yusup, M. 2009. “Multirepresentasi Dalam Pembelajaran Fisika”. [Online]. Tersedia : http://eprints.unsri.ac.id/1670/1/multirepresentasi-dalam pembelajaran-fisika.pdf. Diakses pada 7 Februari 2017.