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This action research aims at increasing self-efficacy and achievements on mathematics of students XI Bahasa of SMA Negeri 1 Singaraja on second semester acedemic year 2018/2019 through the implementation of problem based learning assisted by students’ worksheets. This research involved 22 students of XI Bahasa SMA Negeri 1 Singaraja on second semester academic year 2018/2019. This research was conducted in two cycles which followed a research procedure by Hopkins in each cycle which consisted of planning, acting, observing-evaluating, and reflecting. At the end of each cycle the data about students’ achievements were collected by using mathematical achievement test in order to know the increasing the students’ achievements. Besides that, before and after treatments conducted it was collected data about students’self-efficacy by using questionnaire. Data collected were analyzed descriptively, the research concluded that problem based learning assisted by students’worksheets could increase self efficacy and mathematical achievements of students XI Bahasa SMA Negeri 1 Singaraja on second semester academic year 2018/2019. It could be seen from the increasing of students’self-efficacy 39.68% from average score of self-efficacy 92.65 (sufficient category) before treatment became 129.41 at the end of cycle II (high category). And also the achievements on mathematics of students XI Bahasa SMA Negeri 1 Singaraja increased from 7.73% from average score 64.00 in cycle I became 68.95 in cycle II. From the classical average score on mathematics also increased 59.96% from 22.73% in cycle I became 36.36% in cycle II. Copyright © Universitas Pendidikan Ganesha. All rights reserved. A R T I C L E I N F O Article history: Received 19 February 2019 Received in revised form 30 March 2019 Accepted 10April 2019 Available online 20 May 2019 Kata Kunci: Problem Based Learning, LKS, Self Efficacy, Hasil Belajar.

Penerapan Problem Based Learning Berbantuan LKS untuk Meningkatkan Self-Efficacy dan Hasil Belajar Matematika