The subject of the study was 30 VIIIA students at SMP Negeri 3 Karangasem in the academic year 2013/2014. Each cycle consisted of planning phase, action phase, observation/evaluation phase, and reflection phase. This study was a classroom action research whisch was conducted in 3 cycles. This study aimed at (1) improving the math reasoning and communicating skill of VIIIA students at SMP Negeri 3 Karangasem and (2) investigating the students’ responses towards the implementation of 5E Learning Cycle model assisted by structured student worksheet. Program Studi Pendidikan Matematika, Fakultas Keguruan Dan Ilmu Pendidikan Universitas Mahasaraswati DenpasarĥE Learning Cycle model, structured student worksheet, math reasoning and communicating skill Abstract
