scholarly journals The Implementation of Problem Based Learning Model to Improve Student’s Motivation and Critical Thinking

2019 ◽  
Vol 7 (3) ◽  
pp. 177
Author(s):  
Hestiningtyas Yuli Pratiwi ◽  
Nurul Ain ◽  
Helena Jelita Igut
Keyword(s):  
Critical Thinking ◽  
Lesson Plan ◽  
Problem Based Learning ◽  
Thinking Skills ◽  
Critical Thinking Skills ◽  
Junior High Schools ◽  
Thinking Skill ◽  
Critical Thinking Skill ◽  
Pbl Model

The research aims to analyze the quality of the learning process using the Problem-Based Learning (PBL) model to find out the improvement of student’s motivation and critical thinking skills. It is a classroom action research conducted in two cycles, cycle I consist of 4 meetings, and cycles II consists of 3 meetings, with the topics of Temperature, Expansion, and Heat. The subjects of the research were 34 students on grade VII in one of the junior high schools in Malang. Instruments used to measure the implementation of learning PBL model using the form of implementation sheet following the lesson plan, tools to measure motivation using a poll and to measure the critical thinking skill, and researchers use essay questions. The implementation of the PBL model in the cycle, I was 72.9% and was classified as a good qualification; while in cycle II, it was 91.2% and was classified as a very good qualification. The analysis of student’s learning motivation in pre-cycle was 56%, was classified as a quite good qualification, cycle I was 67.2%. I was classified as a quite good qualification, while in Cycle II, it was 87.2% and was classified as good qualification. The analysis of student’s average critical thinking skills in pre-cycle was 44.12% and was classified lack of good qualification, cycle I was 76.4% and was classified as a quite good qualification; while in cycle II it was 88.4% and was classified as good qualification. The results showed that the PBL model successfully improved motivation and critical thinking skills of students beginning the pre-cycle, cycle I, and cycle II.

scholarly journals Problem Based Learning (PBL) Model: Its Effect in Improving Students’ Critical Thinking Skill

2021 ◽  
Vol 4 (2) ◽  
pp. 183-190
Author(s):  
Dora Aini ◽  
Sri Latifah ◽  
Abdul Hamid
Keyword(s):  
High School ◽  
Critical Thinking ◽  
Problem Based Learning ◽  
Thinking Skills ◽  
Critical Thinking Skills ◽  
Thinking Skill ◽  
Critical Thinking Skill ◽  
Test Instrument ◽  
Essay Test ◽  
Pbl Model

This study aims to determine the effectiveness of the Problem Based Learning (PBL) model on the critical thinking skills of 7th-grade students of SMP Negeri 34 Bandarlampung (Public Senior High School 34 Bandarlampung). This quasi-experiment involved 2 groups of students, totaling 28 students for the Experimental class and 26 students for the Control class. Data collection was obtained by using an essay test instrument which was presented in the pretest and posttest. Based on the research results, it is known that the posttest results of the experimental class are 78.82, and the results of the control class are 74.07. The data were then analyzed by independent sample t-test and obtained tcount (2.213) greater than ttable (2.007). The effectiveness of the Problem Based Learning (PBL) model was tested with the effect size test, the results showed a number of 0.2 with a low category. So, it can be concluded that the Problem Based Learning (PBL) model has an effect on increasing students’ critical thinking skills but with low effectiveness.

scholarly journals PENGARUH PROBLEM BASED LEARNING TERHADAP KETERAMPILAN BERPIKIR KRITIS DAN REGULASI DIRI SISWA KELAS V

2014 ◽  
Vol 2 (2) ◽  
pp. 209 ◽  
Author(s):  
Pricilla Anindyta ◽  
Suwarjo Suwarjo
Keyword(s):  
Critical Thinking ◽  
Self Regulation ◽  
Problem Based Learning ◽  
Thinking Skills ◽  
Learning Model ◽  
Critical Thinking Skills ◽  
Thinking Skill ◽  
Critical Thinking Skill ◽  
Significance Level ◽  
Class E

<p class="E-JOURNALTitleEnglish">Penelitian ini bertujuan untuk mengetahui: (1) perbedaan keterampilan berpikir kritis dan regulasi diri siswa antara kelas yang diajar dengan menggunakan <em>problem based leaning</em> dan kelas yang diajar dengan menggunakan pembelajaran ekspositori dan (2) pengaruh penerapan <em>problem based learning</em> terhadap keterampilan berpikir kritis, dan regulasi diri siswa. Penelitian ini merupakan penelitian eksperimen semu. Populasi penelitian ini adalah seluruh siswa kelas V SD Santo Vincentius Jakarta. Pada kelas eksperimen, pembelajaran IPA dilaksanakan dengan model <em>problem based learning</em>, sedangkan pada kelas kontrol dengan  pembelajaran yang biasa digunakan oleh guru yaitu pembelajaran ekspositori. Instrumen yang digunakan adalah (1) tes untuk mengukur keterampilan berpikir kritis siswa ditinjau dari aspek kognitif, (2) skala perilaku untuk mengukur keterampilan berpikir kritis ditinjau dari aspek perilaku dan regulasi diri siswa. Analisis data menggunakan (1) statistik deskriptif untuk mendeskripsikan data keterampilan berpikir kritis dan regulasi diri siswa, dan (2) statistik infe-rensial dengan menggunakan uji t sampel bebas dan uji MANOVA untuk menguji hipotesis penelitian dengan taraf signifikansi 5% (α = 0,05). Hasil penelitian menunjukkan bahwa: (1) terdapat perbedaan keterampilan berpikir kritis siswa yang signifikan antara kelas yang diajar dengan menggunakan <em>problem based leaning</em> dan kelas yang diajar dengan menggunakan pembelajaran ekspositori, dengan nilai sig. 0,040; (2) terdapat perbedaan regulasi diri siswa yang signifikan antara kelas yang diajar de-ngan menggunakan <em>problem based learning</em> dan kelas yang diajar dengan menggunakan pembelajaran ekspositori, dengan nilai sig. 0,005; (3) penerapan <em>problem based learning</em> berpengaruh secara positif dan signifikan terhadap keterampilan berpikir kritis dan regulasi diri siswa, dengan nilai sig 0,021.</p> <p class="E-JOURNALAbstrakKeywords"><strong>______________________________________________________________________________________________________________________________________________________________________________________________________________________________________</strong></p> <p class="E-JOURNALAbstrakTitle"><strong>THE EFFECT OF APPLYING PROBLEM-BASED LEARNING TO CRITICAL THINKING SKILL AND SELF-REGULATION OF 5<sup>TH</sup> GRADERS<br /></strong></p><p class="E-JOURNALAbstrakTitle"><strong><em>ABSTRACT</em></strong></p> <p class="E-JOURNALAbstractBodyEnglish">The objective of this research is to know: (1) the difference between the student’s critical thinking skills and self regulation of the classes taught using problem based learning and expository learning, and (2) the effect of applying problem-based learning to student’s critical thinking skill and self-regulation. This research is a quasi-experimental research study. The population of this research is all 5th graders of St. Vincentius, Jakarta. In the experimental class, science study was done by problem-based learning model, while in the control class by expository learning model. The instruments used are (1) a test to measure students’ critical thinking skill reviewed from the cognitive aspect, (2) a scale of behavior to measure critical thinking skill reviewed from the behavioral aspect and students’ self-regulation. Data analysis used (1) descriptive statistics to describe the data of students’ critical thinking skill and self-regulation, and (2) inferential statistic by using independent sample t-test and MANOVA test to test the hypothesis of research with the significance level of 5% (α = 0,05).The results of this reseach have shown that: (1) there is a difference between the student’s critical thinking skills of the classes taught using problem based learning and expository learning, with sig 0.040; (2) there is a difference between the student’s self regulation of the classes taught using problem based learning and expository learning, with sig 0.005; (3) the application of problem-based learning positively and significantly influences students’ critical thinking skill dan self regulation, with sig 0.021.</p> <strong>Keywords</strong>: problem-based learning, expository learning, critical thinking skill, self-regulation.<br />

scholarly journals STUDENTS’ MATHEMATICAL THINKING SKILL VIEWED FROM CURIOSITY THROUGH PROBLEM-BASED LEARNING MODEL ON INTEGRAL CALCULUS

2020 ◽  
Vol 10 (1) ◽  
pp. 31
Author(s):  
Zetriuslita Zetriuslita ◽  
Rezi Ariawan
Keyword(s):  
Critical Thinking ◽  
Problem Based Learning ◽  
Sampling Technique ◽  
Thinking Skills ◽  
Learning Model ◽  
Critical Thinking Skills ◽  
Thinking Skill ◽  
Critical Thinking Skill ◽  
Teaching Materials ◽  
Integral Calculus

This study aims to find out the improvement of students’ mathematical critical thinking viewed from curiosity through teaching materials with Problem Based Learning model. This is quasi-experimental research. The samples are, where the overall population consists of 75 samples divided into two classes.  This research employed a simple random sampling technique.  The instruments were the mathematical critical thinking skill test and curiosity questionnaire. The technique of data collection was carried out with test and non-test techniques. The data were analyzed through a two-way Anova test. Based on the analysis and interpretation of the research findings, it was found that: there was an improvement in students’ mathematical critical thinking skill from High curiosity by using teaching materials with Problem Based Learning model; 1) There was an improvement from  Average curiosity through learning with Integral Calculus teaching materials; 2) There was an improvement from Low curiosity; 3) There was no improvement from the level of curiosity (High,  Medium,  Low) through Problem-based Learning. 4) There was no influence between the level of curiosity and learning in improving students’ mathematical critical thinking skills. Do more in-depth studies related to improving mathematical critical thinking skills by reviewing other affective aspects

scholarly journals Penerapan Problem Based Learning untuk Meningkatkan Kemampuan Berpikir Kritis Siswa

2020 ◽  
Vol 12 (1) ◽  
pp. 1
Author(s):  
Desy Triana Dewi
Keyword(s):  
Critical Thinking ◽  
Problem Based Learning ◽  
Thinking Skills ◽  
Learning Model ◽  
Critical Thinking Skills ◽  
Student Response ◽  
Thinking Skill ◽  
Critical Thinking Skill ◽  
Post Test ◽  
Study Plan

The classroom action research is based on lack of student critical thinking skill has an impact result of learning. This study aims to analyze teacher and students’ activities, to improve students’ critical thinking skills and student response by applying Problem Based Learning model to the APBN and APBD materials in Development on eleventh grade of Social Major 3 in 1st Senior High School Puri Mojokerto. This study was conducted in two cycles. Each cycle uses the stages of study plan (planning), implementation (acting), observation (observing), and reflection (reflecting). The instruments used were a post-test to determine the ability to think critically and an observation sheet to find out the teacher's activities, the students' activities and students' responses to the application of Problem Based Learning model. The result showed that the students' critical thinking skills increased from 50% in cycle 1 to 87.5% in cycle 2. Furthermore, the teacher activity showed an increase from 74,76% in cycle 1 to 91.9% in cycle 2. While the students' activity also experienced an increase from 78.19% in cycle 1 to 84.57% in cycle 2, and the students' response reached 89.06%. Therefore, it can be concluded that based on the results, the application of Problem Based Learning model can increase students' critical thinking skills.

scholarly journals Pelatihan OSN Matematika Melalui Soal Berbasis Critical Thinking Skill Bagi Siswa SMP Negeri 4 Tanjungpinang

2020 ◽  
Vol 4 (4) ◽  
pp. 649-654
Author(s):  
Mariyanti Elvi ◽  
Metta Liana ◽  
Dios Sarkity ◽  
Dina Fitriyah
Keyword(s):  
Critical Thinking ◽  
Thinking Skills ◽  
Critical Thinking Skills ◽  
Quality Of Education ◽  
Thinking Skill ◽  
Critical Thinking Skill ◽  
Science Olympiad ◽  
National Science ◽  
Productive Thinking

he National Science Olympiad (OSN) is one of the government's strategies to improve the quality of education in Indonesia. The purpose of OSN is to develop critical, systematic, creative, innovative and productive thinking skills. Critical thinking skills is a present skill that must be developed by students. The results of the OSN which is not optimal, one of which is caused by not optimal preparation by the school in dealing with OSN selection. The purpose of this activity is to equip students of SMP Negeri 4 Tanjungpinang so they are ready Mathematics Olimpiade selection by giving questions based on critical thinking skills. The results of this activity are (1) students are very competitive and enthusiastic in participating in training, (2) students arealso motivated to participate in OSN 2020 selection, (3) the application of critical thinking skills makes it easier for students to analyze questions and solve them

scholarly journals UPAYA PENINGKATAN KEMAMPUAN BERPIKIR KRITIS DAN HASIL BELAJAR TEMATIK MELALUI MODEL PROBLEM BASED LEARNING (PBL) KELAS V SD

2019 ◽  
Vol 3 (2) ◽  
pp. 367-375
Author(s):  
Wahyu Purnaningsih ◽  
Stefanus Christian Relmasira ◽  
Agustina Tyas Asri Hardini
Keyword(s):  
Critical Thinking ◽  
Model Problem ◽  
Problem Based Learning ◽  
Thinking Skills ◽  
Class Action ◽  
Critical Thinking Skills ◽  
Thinking Skill ◽  
Critical Thinking Skill ◽  
Analysis Technique ◽  
Data Collection Technique

Tujuan penelitian ini adalah untuk meningkatkan Kemampuan Berpikir Kritis dan Hasil Belajar dengan melalui penerapan model Pembelajaran Problem Based Learning (PBL). Jenis penelitian yang digunakan adalah Penelitian Tindakan Kelas(PTK) dengan subyek penelitian yaitu siswa kelas V SDN Tegalrejo 01 yang berjumlah 28 siswa yang terdiri dari 13 siswa laki-laki dan 15 siswa perempuan. Teknik pengumpulan data meliputi observasi, studi dokumen, tes dan non tes. Teknis analisis data yang digunakan berupa deskriptif kuantitatif dan deskriptif kualitatif. Hasil penelitian ini terdiri dari dua siklus: (1) siklus I dari penerapan model Problem Based Laerning pada kemampuan berpikir kritis dengan rata-rata 58,57%, selanjutnya untuk hasil belajar rata-rata sebesar 71,57%; (2) siklus II tindak lanjut dari kelemahan dan kekurangan dalam siklus pertama, pada tahap ini  hasil kemampuan berpikir kritis meningkat sebesar 76,19%%, selanjutnya untuk hasil belajar rata-rata sebesar 82,68%. Berdasarkan ulasan tersebut dapat disimpulkan penerapan model Problem Based Laerning dapat meningkatkan kemampuan berpikir kritis dan hasil belajar siswa.   ABSTRACT The purpose of this research is to improve Critical Thinking Skill and Learning Result through Problem Based Learning (PBL) model. The type of the research used is Class Action Research and the subject of the research is 28 students of grade V of SDN Tegalrejo 01, consist of 13 male students and 15 female students. The data collection technique include observation, document study, test and non test. The data analysis technique used are descriptive quantitative and descriptive qualitative. The result of the research consist of two cycles: (1) cycle 1 Problem Based Learning application on critical thinking skills with the average of 58, 57% and for learning result 71,57%; (2) cycle 2 follow up from the weakness and shortage of the first cycle, in this stage the critical thinking skill average increase in the amount of 76,19%, and for learning result increase with the average of 82,68%. Based on the review, it can be concluded that the use of the Problem Based Learning model can improve the students' critical thinking skill and learning result.  

scholarly journals Pengaruh Model Pembelajaran Berbasis Masalah terhadap Pemahaman Konsep IPA dan Keterampilan Berpikir Kritis Siswa SMP Negeri 4 Bebandem.

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
NI MADE AYU RATNA PARWATHI . ◽  
PROF. DR. I WAYAN SANTYASA, M.Si. . ◽  
DR. I WAYAN SUKRA WARPALA, S.PD.,M.Sc .
Keyword(s):  
Critical Thinking ◽  
Conceptual Understanding ◽  
Problem Based Learning ◽  
Sampling Technique ◽  
Thinking Skills ◽  
Learning Model ◽  
Critical Thinking Skills ◽  
Thinking Skill ◽  
Critical Thinking Skill ◽  
Better Than

Penelitian ini bertujuan mendeskripsikan perbedaan pemahaman konsep (PK) IPA dan keterampilan berpikir kritis (KBK) siswa antara yang belajar dengan model pembelajaran berbasis masalah (MPBM) dengan yang belajar dengan model pembelajaran konvensional (MPK). Penelitian eksperimen semu ini melibatkan 5 kelas siswa kelas VII SMP Negeri 4 Bebandem Karangasem Tahun Pelajaran 2015/2016 sebagai populasi. Dua sampel ditentukan dengan teknik acak kelas, yaitu kelas VIIA menggunakan model PBM dan Kelas VIID dengan Model PK. Data PK IPA dan KBK dikumpulkan dengan tes. Data dianalisis secara deskriptif dan MANCOVA satu jalan dengan PK dan KBK awal berperan sebagai kovariabel. Setelah perlakuan dikontrol dengan PK dan KBK awal, hasil penelitian menunjukkan bahwa terdapat perbedaan signifikan PK IPA dan KBK siswa antara yang belajar dengan MPBMdanMPK.Baik PK IPA maupun KBK siswa yang belajar dengan MPBM lebih baik dibandingkan dengan yang belajar dengan MPK. Kata Kunci : pembelajaran berbasis masalah (problem based learning/PBL), pemahaman konsep IPA, keterampilan berpikir kritis. This study aims to describe the differences of conceptual understanding (CU) in science and students’ critical thinking skills (CTS) between them learned in problem-based learning model (PBLM) and conventional learning model (CLM). Thisquasi-experimental in volved 5 classes student of the 7 grade of students in SMP Negeri 4 Bebandem Karangasem in the year 2015/2016 asa population. Two classes as samples were determined by group random sampling technique, namely class VIIa used PBL and Class VIID utilized conventional learning models (CL). The data of CU inscience and CTS of students were collected by tests. Data were analyzed descriptive and one way of MANCOVA with prior of CU as well as CTS a cts as covariates. After the treatment was controlled by prior of CU and CBC, there were significant differences in CU and CTS of students between them learned in the PBLM and CLM. Neither CU in scine and students’ CTS who learned in the PBLM were better than CLM.keyword : problem-based learning ( PBL), undertanding of science concepts, critical thinking skill.

scholarly journals Problem-Based Learning with Argumentation as a Hypothetical Model to Increase the Critical Thinking Skills for Junior High School Students

2020 ◽  
Vol 9 (3) ◽  
pp. 340-350
Author(s):  
R. W. Akhdinirwanto ◽  
R. Agustini ◽  
B. Jatmiko
Keyword(s):  
High School ◽  
High School Students ◽  
Critical Thinking ◽  
Junior High School ◽  
Junior High ◽  
Problem Based Learning ◽  
Thinking Skills ◽  
Critical Thinking Skills ◽  
Thinking Skill ◽  
Critical Thinking Skill

The Problem-Based Learning with Argumentation (PBLA) model is a development model of Problem-Based Learning (PBL) added to the Toulmin Argumentation activity to increase the critical thinking skill in junior high school. The research aims to determine the feasibility of PBLA in terms of its validity and effectiveness. The research samples are two groups of students (class 1 and class 2) with 26 students in each class. Before learning to use PBLA, each class was given a pretest, and after learning to use PBLA were also given a posttest. PBLA validity data were obtained through validity sheets and analyzed through expert agreement. PBLA effectiveness data was obtained through critical thinking skill tests and analyzed by paired t-test, n-gain, and two-average similarity test. The results showed that the content validity and the construct validity categorized as valid with a score of 3.5 and 3.3. The reliability scores obtained are 77.10% and 77.67%. The critical thinking skill data showed a significant increase in critical thinking skill at α = 5%, the average n-gain was categorized high, and there was a similarity in increasing critical thinking skills for the two classes. In conclusion, PBLA is effective in increasing critical thinking skills for junior high school students

scholarly journals The Effect of PBL Model Based Local Wisdom Towards Student’s Learning Achievements on Critical Thinking Skills

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Khaerus Syahidi ◽  
Tsamarul Hizbi ◽  
Asriwani Hidayanti ◽  
Fartina Fartina
Keyword(s):  
Critical Thinking ◽  
Student Learning ◽  
Problem Based Learning ◽  
Sampling Technique ◽  
Thinking Skills ◽  
Critical Thinking Skills ◽  
Learning Models ◽  
Thinking Skill ◽  
Critical Thinking Skill ◽  
Learning Achievement

This study aims to determine 1) Effect of the Problem Based Learning (PBL) based local wisdom model towards students’ learning achievement 2) Effect of the critical thinking towards students learning achievement 3) Interaction between the use of learning models and critical thinking skills towards student learning achievement. This study was experimental study. The population of this study were all students of class X IPA at SMA AL-Hamzar Tembeng Putik in academic year 2019/2020. The sample of this study was selected by saturated sampling technique which was Class X IPA 1 as an experimental class while class X IPA 2 was as a control class. The research design of this study was 2 x 2 factorial design. the data collection techniques of this study used critical thinking questionnaires and achievement tests. The data were analyzed by using two ways Anova. The results showed that; 1) there was an effect of problem based learning (PBL) based local wisdom on student learning achievement, it proved by the result of FA count> Ftable was 11.29> 4.00, which meant H0A was rejected, 2) There was an effect of critical thinking skill towards student learning achievement, it proved by the result of FB> Ftable was 5.51> 4.00 which meant that H0B is rejected. 3) There was no interaction between the use of learning models with the Critical thinking skill towards student achievement, it is because FABcount <Ftable was 0.98 <0.04 which meant H0AB is accepted.

scholarly journals Analisis Kemampuan Berpikir Kritis Siswa Kelas XI MIA2 SMA Negeri 1 Masamba melalui Model Pembelajaran Berbasis Masalah pada Materi Pokok Asam Basa

2019 ◽  
Vol 19 (2) ◽  
pp. 167
Author(s):  
Nurul Hidayah ◽  
Halimah Husain ◽  
Netti Herawaty
Keyword(s):  
Critical Thinking ◽  
Problem Based Learning ◽  
Strong Acid ◽  
Thinking Skills ◽  
Weak Acid ◽  
Critical Thinking Skills ◽  
Thinking Skill ◽  
Critical Thinking Skill ◽  
Acid Base ◽  
Degree Of Ionization

ABSTRAK Penelitian deskriptif ini bertujuan untuk mengetahui bagaimana kemampuan berpikir kritis siswa melalui model Pembelajaran Berbasis Masalah pada siswa kelas XI MIA2 SMA Negeri 1 Masamba pada materi pokok asam basa. Subjek penelitian ini adalah siswa kelas XI MIA2 yang berjumlah 29 orang. Data hasil penelitian diperoleh dari hasil observasi selama proses pembelajaran untuk mengetahui kemampuan berpikir kritis proses dan nilai tes hasil belajar untuk mengetahui kemampuan berpikir kritis produk. Disimpulkan bahwa rata-rata kemampuan berpikir kritis proses siswa adalah 67,24% dikategorikan tinggi, dengan rincian indikator: 1) memberikan penjelasan sederhana sebesar 73,45% 2) membangun keterampilan dasar sebesar 70,34% 3) menyimpulkan sebesar 67,76% 4) memberikan penjelasan lanjut sebesar 63,97%, dan 5) mengatur strategi dan taktik sebesar 60,69%. Sedangkan rata-rata kemampuan berpikir kritis produk siswa adalah 26,94% dikategorikan sangat rendah. Persentase pencapaian siswa pada setiap indikator pembelajaran dengan materi asam basa yaitu: 1) menganalisis teori asam basa berdasarkan konsep Arrhenius, Bronsted Lowry dan Lewis adalah 36.25%, 2) menganalisis indikator yang dapat digunakan untuk membedakan asam basa adalah 70.94%, 3) memprediksi pH larutan dengan menggunakan beberapa indikator adalah 46.98%), 4) menghitung pH larutan asam/basa kuat dan asam/basa lemah adalah 22.13%, dan 5) menghubungkan asam/basa lemah dengan asam/basa kuat untuk mendapatkan derajat ionisasi (α) atau tetapan ionisasi adalah 7.50%. Kata kunci: Pembelajaran berbasis masalah, Berpikir kritis, Asam Basa ABSTRACT The aim of this deskriptif research is to determine how Student’s Critical Thinking Skill by Using Problem Based Learning Model to Students of Class XI MIA2 SMAN 1 Masamba in Material of Acid-Base. The subject of this research were students of XI MIA2 the counsist 29 studensts. The data was obtained by observation during the learning to know critical thinking skill of process and student’s learning achievement is to know critical thinking skill of product. It was concluded that the average critical thinking ability process of the students is 67.24% and categorized as high. Percentage of critical thinking process are: 1) elementary clarification indicator is 73,45%, 2) basic support indicator is 70,34%, 3) inferences indicator is 67,76%, 4) advance and clarification indicator is 63,97%, 5) and strategy and tactic indicator is 60,93% while the average product of students' critical thinking skills are 26,94% and categorized as very low. The percentage of student achievement on each indicator learning materials acid-base are: 1) indicator to analyze the theory of acids and bases is based on the concept of Arrhenius, Bronsted Lowry and Lewis was 36.25%, 2) indicators analyzing indicators that can be used to distinguish acid-base is 70.94%, 3) indicator predicts the pH of the solution using several indicators are 46.98%), 4) indicator calculates pH of strong acid/base and weak acid/base is 22.13%, and 5) indicators linking the weak acid/base with strong acid/base to obtain the degree of ionization (α) or constant ionization is 7.50%. Keywords: Problem based learning, Critical thinking, Acid-Base

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