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241	Mathematics Education	ABS-134
APPLICATION OF THE SCIENTIFIC APPROACH USING GUIDED INQUIRY TO FIND THE ABILITY OF CRITICAL THINKING STUDENTS Reni Dwi Susanti Universitas Muhammadiyah Malang Abstract This study aims to describe the application of a scientific approach using guided inquiry and see the level of critical thinking skills of students in Social Statistics courses. This type of research is descriptive with a qualitative approach. Data collection methods in This study uses observations and tests. Data obtained from 60 students. The results showed that the application of the scientific approach using guided inquiry in Social Statistics courses can be carried out following the learning steps that have been prepared with an average student activity of 80%. Student learning activities during learning are categorized as good, with details of activities observing, reasoning, trying and communicating the same category which is good, while the questioning activity is quite good. Students critical thinking skills as a whole are classified as very good, with details that are classified as high in the aspects of identifying the assumptions given, and in good categories on the indicator of revealing data/definitions/ theorems to solve problems and evaluating aspects in solving problems. Keywords: guided inquiry, scientific approach, critical thinking PermaLink | Plain Format | Corresponding Author (Reni Susanti)

242	Mathematics Education	ABS-135
The use of Realistic Mathematics Education theory for designing algebra learning sequence: The case of linear equations in one variabel D Usdiyana1, A Jupri1, dan R Sispiyati1 1Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Setiabudhi No. 229, Bandung 40154, Indonesia Email: dianusdy[at]upi.edu Abstract Abstract. This research aims to design an algebra learning sequence on the topic of linear equations in one variable—which was taught in Junior High School. We used design research method to do this, and preliminary design phase in particular. First, we designed a sequence of daily life problems in order for students can be familiar with this. This sequence of problems was used for designing a learning sequence. Next, we designed a sequence of learning according to the theory of Realistic Mathematics Education because this theory provides meaningful mathematics for students. Finally, we discussed the design to obtain final learning sequence for a teaching experiment. We consider that the result of the learning design is better than the conventional learning sequence, and it is more meaningful for students. Keywords: Realistic Mathematics Education and linear equations in one variabel PermaLink | Plain Format | Corresponding Author (Dian Usdiyana)

243	Mathematics Education	ABS-138
Spatial Representation in Solving Space Geometry Viewed from Brunner’s Theory 1st Resy Nirawati, 2nd Darhim, 3rd Siti Fatimah 1,2,3Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, IndonesiaAffiliation, 1STKIP Singkawang, Jl. STKIP Kelurahan Naram Singkawang, Kalimantan Barat 79251, Indonesia Abstract This study aims to analyze the ability of spatial representation in solving space geometry in terms of brunner’s theory.. Research result of the spatial represetation ability namely 1) students sketch the picture and illustrate the problem presented; 2) students work on the question given with complete stages (processes) by using the right concept (presenting conceptual concepts formed from old concepts) and 3) students explain the concept process that is done by using their own language. While based on brunner’s stages in the enactive phase, students manipulate objects observed to find certain pattern, concepts or principles. For the iconic stages students visualize geometric objcts in a sketch or picture. Furthermore for the symbolic phase students recontruct concepts thet have been visualize to be described with words or sentences and express them in the form of a formula. Keywords: Spatial representation, Geometry, Brunner’s theory PermaLink | Plain Format | Corresponding Author (RESY NIRAWATI)

244	Mathematics Education	ABS-142
Analysis of Students Mathematical Reflective Thinking Ability in Number Pattern Fitriani Apendi (a), Sufyani Prabawanto (b) (a) Universitas Pendidikan Indonesia, Jalan Dr. Setiabudhi No. 229 Bandung, Jawa Barat, Indonesia 40154 (b) Department of Mathematics Education, Universitas Pendidikan Indonesia, Jalan Dr. Setiabudhi No. 229 Bandung, Jawa Barat, Indonesia 40154 (a) fitriani14[at]upi.edu (b) sufyani[at]upi.edu Abstract The ability of mathematical reflective thinking must be possessed by students in Industry 4.0. This study used descriptive qualitative research that aims to determine the reflective thinking ability of senior high school students on pattern numbers. The research subjects were 10 students of class XI. Based on data analysis, it is found that: generally students could (a) check the validity of arguments based on the concepts used, (b) identify mathematical concepts used in mathematical solutions by reasons, and (c) show the difference between relevant and irrelevant data in solving the problems. Whereas only few students can (a) generalize by reasoning, and (b) solve the problems using various strategies. Keywords: Mathematical Reflective Thinking, Patterns of Numbers PermaLink | Plain Format | Corresponding Author (Fitriani Apendi)

245	Mathematics Education	ABS-148
Realistic Mathematics Education: A Learning Innovation in Enhancing Students Algebraic Thinking Ability Didi Suhaedi Program Studi Matematika, Universitas Islam Bandung Abstract Algebra thinking is one of the abilities students must have in learning school algebra. The weak algebraic thinking ability of junior high school students is one part of the problems in mathematics education. One effort to solve these problems is to innovate learning with a realistic mathematics education approach. This study is a quasi-experiment about improving students algebraic thinking abilities, with the experimental class using the realistic mathematics education approach and the control class using conventional learning. The research sample consisted of 134 eighth grade students of junior high schools in Bandung. The results of the study show that increasing the algebraic thinking ability of students who get learning with a realistic mathematics education approach is better than students who get conventional learning at every level of students initial mathematical knowledge. Keywords: school algebra, algebraic thinking, realistic mathematics education PermaLink | Plain Format | Corresponding Author (Didi Suhaedi)

246	Mathematics Education	ABS-156
INCREASING CRITICAL THINKING SKILLS ON THE TOPIC OF PLANE GEOMETRY BY USING HAWGENT MATHEMATICAL SOFTWARE Tommy Tanu Wijaya1 Aditya Purnama2 Martin Bernard3 Padillah Akbar 4 IKIP Siliwangi Abstract Abstract. The purpose of this research is to know the effect of learning media on the junior high school students’ critical thinking skills on the topic of plane geometry by using hawgent dynamic mathematical software. The sample of this research would be 9th grade student in one of the junior high school in Cimahi with a total of 30 students in the school year of 2019/2020. The collection of the data is by using pre-test and post test to compare the critical thinking skills of the experimental class with the controlled class. The result of this research is that hawgent dynamic mathematical software boost the students’ critical thinking skills and also comparing the increase of students’ critical thinking skills on the topic of plane geometry. Keywords: Hawgent dynamic mathematical software, plane geometry, junior high school PermaLink | Plain Format | Corresponding Author (tommy tanu wijaya)

247	Mathematics Education	ABS-160
THE INFLUENCE OF VBA FOR POWERPOINT REALISTIC MATHEMATIC EDUCATIONS APPROACH TO MATHEMATICAL UNDERSTANDING ABILITY AND LEARNING LEARNING OF SMP STUDENTS IN CIMAHI CITY Siti Chotimah 1, Yana2, Martin Bernard3, Arif Supriyadi3 IKIP SILIWANGI Abstract This research is motivated by still have low ability of students mathematical understanding and lack of student independence in learning mathematics, to overcome these problems it is necessary to have an approach in learning. The alternative approach applied is the realistic mathematic educations approach. This study aims to determine and examine the mathematical understanding ability of junior high school students in one school in Cimahi. The research method used was experimental method in the form of pretest-posttest control group design. The population in this study were all seventh grade junior high school students in Cimahi, while the sample was seventh grade junior high school students in one of the Schools in Cimahi representing population characteristics. The data collection in this study uses a test type description and non-test that is a questionnaire. Then the data is processed using SPSS-16 and Microsoft Excel. Based on the results of the study it can be concluded that the mathematical understanding ability of junior high school students whose learning uses the Model-Eliciting Activities approach is better than that using conventional learning, student learning independence using realistic mathematic educations approache is better than those using conventional learning, and the implementation of learning using the Model approach -Electiting activities in the field are in accordance with the steps that make students more active in learning mathematics. Keywords: Mathematical Understanding Ability, Learning Independence, Realistic Mathematics Educations PermaLink | Plain Format | Corresponding Author (siti chotimah)

248	Mathematics Education	ABS-168
How to Apply metacognitive strategies in collaborative learning settings? Muntazhimah(a*), Turmudi(b), S Prabawanto(b) (a) Universitas Muhammdiyah Prof. Dr. Hamka *muntazhimah[at]uhamka.ac.id (b) Universitas Pendidikan Indonesia Abstract Many study explained that one of the ways to enhance student’s mathematics ability is by giving the students mathematics learning which could encourage them to control the cognitive processes that they have. The alternative is could be metacognitive strategy. By metacognitive strategy, students are guided to be able to realize what they know and what they don’t know in order to resolve the problem. Metacognitive strategy could be apply in collaborative learning settings in wich collaboration is also one of the competencies in 21st century skills. This study aims to explain the applying of metacognitive strategy in collaborative learning setting at mathematics class by preliminary study and literature study which summarizing and analyzing the result of various study that has been done. Using metacognitive in collaborative learning will increase mathematics ability because it foster confidence and awareness of mathematics concepts and principles learned and control the thought processes carried out .The impact is the metacognitive strategies could be applied in collaborative learning settings in order to enhance student’s mathematics ability Keywords: metacognitive strategy, collaborative Learning PermaLink | Plain Format | Corresponding Author (Muntazhimah Muntazhimah)

249	Mathematics Education	ABS-170
Didactic Transposition on The Concept of Central Angle and Circumferential Angle in Junior High School Agus winarji (a*), Turmudi (b) (a) Mathematics Education, School of Postgraduate Studies, Indonesia University of Education, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia *E-mail: agus.winarji[at]upi.edu (b) Mathematics Education, School of Postgraduate Studies, Indonesia University of Education, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia Abstract A study conducted to analyze the didactic transposition process on the concept of central angle and circumferential angle in junior high school. This research is a hermeneutic phenomenology research. Geometry textbooks, the 2013 curriculum and junior high school mathematics textbooks analyzed were the data sources in this study. Descriptive analysis is used to analyze the didactic transposition process. The results of this study indicate that there is no structural change in the concept of the central angle and the circumferential angle from scholarly mathematics to school mathematics. But there is a change in form in the concept of the central angle and the circumferential angle from scholarly mathematics to school mathematics. In school mathematics, the concepts presented are contextual, concrete and simple. While in scholarly mathematics, the concepts presented are abstract. This change in form adjusts the level of cognitive development of students. Keywords: didactic transposition, central angle, circumferential angle PermaLink | Plain Format | Corresponding Author (agus winarji)

250	Mathematics Education	ABS-172
Students Creative Mathematical Thinking Abilities In Triangles and Quadrilateral Sry Rita Puspitasari (a*) Wahyudin (b) a) Sekolah Pascasarjana Universitas Pendidikan Indonesia Jl. Dr. Setiabudi No.229, Bandung 40154, Indonesia *sryrita27[at]upi.edu b) Departemen Pendidikan Matematika Universitas Pendidikan Indonesia2 Jl. Dr. Setiabudi No.229, Bandung 40154, Indonesia Abstract This study aims to obtained a picture of students mathematical creative thinking abilities on triangles and quadrilateral material, which involves 4 indicators namely fluency, flexibility, originality and elaboration. The method in this study was a qualitative descriptive study, which was conducted on 31 students at one junior high school in Cipatat sub-District. Data in this study were obtained through tests and interviews. The results of this study indicate that there is a tendency that flexibility indicators can be mastered well by students and based on an average score of 2.37 that is in TKBK 2. The conclusion of this study is the mathematical creative thinking ability of students in one junior high school in Cipatat sub-District is quite creative. Keywords: Creative Thinking; Triangles and Quadrilateral PermaLink | Plain Format | Corresponding Author (Sry Rita Puspitasari)

251	Mathematics Education	ABS-173
Didactical Design of Circle Equation and Tangent of Circle in Analytic Geometry Learning Nanang Diana1*, Didi Suryadi2, Jarnawi Afgani Dahlan2 (1,2) Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia (1)STKIP Taman Siswa Bima, Jl. Pendidikan No.01 Palibelo-Bima Abstract This study aims to formulate an alternative learning design related to the concept of circle equations and tangents to analytic geometry learning through student learning obstacle. This is descriptive qualitative didactic design research (DDR) by identifying the learning obstacle of students obtained equations of circular equations and tangents of circles, then compiling pedagogical didactic anticipations through identified learning obstacle. This research subjects is the sixth semester students of analytic geometry courses. Data collection was carried out using documentation, interview, test and questionnaire techniques. The results showed an alternative didactic design that could be used in learning equation of circles and tangents of circles and was able to facilitate students as a source of support for learning activities. Keywords: Didactical Design,Circle Equation and Tangent of Circle, Learning Obstacle. PermaLink | Plain Format | Corresponding Author (Nanang Diana)

252	Mathematics Education	ABS-191
THE EFFECTIVENESS OF CYCLE LEARNING MODEL (5E & 7E) IN STUDYING THE PLANE VIEWED FROM SELF-EFFICACY OF JUNIOR HIGH SCHOOL STUDENTS Wita Ratna Puspita *, Frena Fardillah ** Mathematics Educations, Universitas Pendidikan Indonesia, Jl. DR. Setiabudi No. 229, Isola, Sukasari, Bandung, 40154, Indonesia *witaratna[at]upi.edu , **frenafardillah[at]upi.edu Abstract Abstract. The purpose of this research is to verified the effectiveness of teaching mathematics by applying learning cycle 5E and 7E model; and to find out whether those models to be more effective in terms of self-efficacy of 8th grade junior high school students in studying the plane. The research population is 8th grade students of junior high school in Yogyakarta which is derived from a high and medium-level school. The test statistic used is a two-way anova, independent sample t test, and the N-gain formula at the significance level of 5%. It shows that: 1) there is no distinction of self-efficacy between students applied LC 5E and LC 7E models; 2) self-efficacy of students whom applied LC 5E is not higher than LC 7E models in high or medium-level school; and 3) there is no interaction between learning cycle models with school level in learning the plane. Keywords: Learning Cycle; Self-efficacy PermaLink | Plain Format | Corresponding Author (Wita Ratna Puspita)

253	Mathematics Education	ABS-192
Engineering Students’ Participations and Creativity Towards Flipped Classroom Method: A Case Study Siti Khoiruli Ummah University of Muhammadiyah Malang Abstract Abstract— Blended Learning using Canvas became familiar method in 2019 because of the easiest access and the centralized system management in university. This paper aimed to describe the findings of case study focusing on the engineering students’ participation and the creativity in implementation of flipped classroom method emphasizing group discussion and students’ answer sheets. The findings were optimally reached from online group discussion, paper-based test, and online test using qualitative approach. The findings were surprised because the engineering students through flipped classroom were more active than in the classroom. There were more comment in group discussion and the answer from discussions’ topic were vary. The discussion was more interactive because every students has different questions that must be answered by other students. The engineering graduated students could answered fluently and vary. The students’ answer on paper-based test and online test were vary and all the questions was answered correctly. It could be said that flipped classroom optimally implemented so that change the students’ participation and creativity significantly. Keywords: Blended learning; Canvas; engineering students; flipped classroom; online group discussion; students’ participations; creativity; mathematics engineering PermaLink | Plain Format | Corresponding Author (Siti Khoiruli Ummah)

254	Mathematics Education	ABS-200
Analysis of Instruments and Students Abilities in Material Number Patterns Using the Rasch Model Tia Purniati1, Turmudi1, Maya Evayanti2, and Didi Suhaedi3 1Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia 2SMP Laboratorium Percontohan UPI, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia 3Program Studi Matematika, UNISBA, Jl. Tamansari No. 1, Bandung Abstract This study aims to analyze the instruments and abilities of students on material number patterns using the Rasch model. The instrument analyzed was in the form of essays and consisted of eight questions. The instrument was tested on 29 8th grade junior high school students consisting of 15 female students and 14 male students. Instrument analysis and student ability using the Rasch model based on instrument difficulty (item measure), student ability level (person measure), Wright map (person-item map), and instrument analysis. The results showed that there was one difficult question, six medium questions, and one easy question. In addition, there were five students with high abilities, sixteen students with medium abilities, and eight students with low abilities. The level of difficulty of the diversity instruments is not far adrift, but the level of student ability varies. The average level of student ability is above the average level of difficulty of the Instrument. The interaction between students and instruments as a whole is bad. The consistency of answers from students is weak, but the quality of the instrument is sufficient Keywords: number patterns, Rasch model PermaLink | Plain Format | Corresponding Author (Tia Purniati)

255	Mathematics Education	ABS-219
Pre-service Mathematics Teachers Skills: Analyze of Geometry Thinking, Logical Thinking, Habits of Mind and Resilience in Mathematics Tri Nopriana, Siska Firmasari Universitas Swadaya Gunung Djati Abstract Good candidates for mathematics teachers are those who have good thinking skills especially in mathematics, good habits of mind and the ability to survive under pressure. Those skills are reflected in the level of geometric thinking, the level of logical thinking, the scale of habits of mind and resilience in mathematics. The purposes of this study were to analyze the achievement of the level of geometric thinking, the level of logical thinking of pre-service mathematics teachers, describe the habits of mind and student resilience in mathematics. The research subjects consisted of 30 mathematics education students at FKIP Swadaya Gunung Djati University (UGJ) as pre-service mathematics teachers who would practice by teaching in schools. The instruments in this study were: (1) van Hieles geometrical thinking test developed by The Cognitive Development and Achievement in the Secondary School Geometry Project (CDASSG), (2) the logical thinking test (TOLT) designed by Tobin and Capie, (3) The Habits of Minds Scale, and (4) Mathematical Resilience Scale with 4 categories of Likert models. The results of the study were that pre-service mathematics teachers achieved: (1) the level of van Hieles geometrical thinking at the stage of informal deduction, (2) the level of logical thinking at the formal thinking stage, meaning pre-service mathematics teachers were able to solve problems related to proportional reasoning, variable reasoning, correlational reasoning, and combinatorial reasoning. Furthermore, on the soft skills, pre-service mathematics teachers have (3) habits of mind in the good category with an average achievement of 74.5%, this is also seen in achievement (4) the resilience in mathematics who have a good category with an average achievement of 73.6%. Based on the results of the study, it can be concluded that overall the pre-service mathematics teachers in FKIP UGJ have good abilities in geometrical and logical thinking, the habits of mind and resilience in facing mathematical problems. Keywords: Van Hieles Geometry Thinking, Logical Thinking, Habits of Mind, Resilience in Mathematics PermaLink | Plain Format | Corresponding Author (Tri Nopriana)

256	Mathematics Education	ABS-222
PROCEDURAL KNOWLEDGE VERSUS CONCEPTUAL KNOWLEDGE OF FRACTION: An Indonesian Junior High School Case Study Winda Ramadianti, Nanang Priatna, Kusnandi Universitas Pendidikan Indonesia Abstract Fractions is one of the basic topics in mathematics. Knowledge about fraction relates conceptual knowledge and procedural knowledge. Therefore, the instructions about fractions have to consider them. To investigate ways of conceptual knowledge and procedural knowledge at mathematics instruction in junior high school, we observed mathematics instruction in two different classes which were taught by different teachers. This research was conducted at a junior high school in Bengkulu, Indonesia. The results showed that procedural knowledge was discussed more than conceptual knowledge. In addition, the study also found that almost procedural knowledge has not yet been connected with conceptual knowledge. Keywords: fraction, procedural knowledge, conceptual knowledge PermaLink | Plain Format | Corresponding Author (Winda Ramadianti)

257	Mathematics Education	ABS-224
Developing of Teaching Materials for Statistics Method Using Hybrid Learning in Industry Challenges 4.0 S Sowanto (a*), A Dimyati (b), Andang (a), Mutmainnah (a) a) Department of Mathematics Education, STKIP Bima, Jl. Piere Tendean, Bima, Indonesia (b) Department of Mathematics Education, Fakultas Ilmu Tarbiyah & Keguruan (FITK) UIN Syarif hidayatullah, Jakarta *sowantos[at]gmail.com Abstract This research is based on the absence of teaching materials on statistical methods oriented to the Indonesian National Qualification Framework (INQF) in the era of the industrial revolution 4.0 which can facilitate students majoring in mathematics education at STKIP Bima with a hybrid learning model that combines face-to-face learning in the classroom and e-learning. The purpose of this study is to produce products in the form of teaching materials that design at online class that is adjusted to hybrid learning oriented to INQF. The method used is design research which includes: (1) preliminary design, in this phase is made Hypothetical Learning Trajectory (HLT); (2) experiments, in this phase existing designs are tested to students; (3) retrospective analysis, in this phase the researchers compare the HLT with the actual student learning process. The results of this research showed that tasks which were presented in teaching materials that combine face-to-face learning in the classroom and e-learning in the form of online classes by considering learning obstacle and preliminary study able to facilitate students to understand the preliminary statistics material, data presentation, and measure of central tendency. Keywords: Hybrid Learning, Development of Teaching Materials, Indonesian National Qualification Framework PermaLink | Plain Format | Corresponding Author (Sowanto Sowanto)

258	Mathematics Education	ABS-225
Developing Learning Probability In The Ninth Grade Students With a Realistic Mathematics Education Approach Neni Prihartini, Puspita Sari, Ibnu Hadi - Abstract Probability is one of the subjects in learning mathematics in the ninth grade. Based on the results of preliminary tests conducted, students still get difficulties in restating a concept of probability, students still mistaken in giving examples and not examples of probability events, and the relationship between theoretical and empirical probability, and also students still have difficulty in exploring empirical probability. That is because learning done in school is less meaningful for students. Therefore, this study aims to develop learning probability through the Realistic Mathematics Education (RME) approach. This research using design research method which consists of three cyclic phases, such as though experiment, instruction experiment, and retrospective analysis. Data in this study was obtained from student worksheets, interview sheets, field notes sheets, Hypothesis Learning Trajectory (HLT), voice recordings, and pictures. Based on the results of a retrospective analysis, learning with the RME approach can develop students ability in understanding probability concept. Students can understand theoretical and empirical probability, comparing the chance of events, and understanding the frequency of expectations in empirical events. RME principles can support students’ thinking through the use of contexts, the use of the models, the use of student construction results, interactivity, and the intertwining of various learning strands. Keywords: Understanding, Probability, RME PermaLink | Plain Format | Corresponding Author (Neni Prihartini)

259	Mathematics Education	ABS-228
MEDIA DEVELOPMENT OF ORDINARY FRACTIONS OF MATHEMATICS LEARNING INTO MATHEMATICAL MIXTURE FRACTIONS TO INCREASE THE UNDERSTANDING ABILITY OF BASIC SCHOOL STUDENTS USING VBA FOR EXCEL Arif Sunaryo, Martin Bernard, Rosalina Rolina, Dwi Bintang Ramadan, Neng Nurindah Sari, Riki Tata Ramdani, Nurlaela Tussaadah, Prilalianty Fakhriyah IKIP Siliwangi Abstract There are still many students who have difficulty in learning mathematics about the matter of changing ordinary fractions into mixed fraction forms because students do not understand the provisions that are the basis of how ordinary fractions can be transformed into mixed fractions. That is still not able to distinguish the definitions of the numerator and the denominator in fractions, besides that students have not been able to interpret the form of fractions correctly in terms of the fundamental ability of understanding the mathematical thinking process. The benefit of VBA for Excel elementary school is to associate mathematical concepts from fractional material that can help students understand the thinking process in visual form. The development of technology now makes the media more efficient and faster, therefore with the help of technology, a teacher or teacher can make a lot of media that is tailored to the needs of teaching in the classroom. The method used in media development uses ADDIE (Analysis of Design Development Implementation and Evaluation). And the feasibility of instructional media from the assessment of media experts and material experts. Before carrying out implementation in class, the media and material are assessed by users or elementary school mathematics teacher to get a questionnaire assessment and enter the evaluation as a media improvement that will be implemented to students. Keywords: Understanding Ability, VBA for Excel, ordinary fractions, mixture fractions PermaLink | Plain Format | Corresponding Author (Arif Sunaryo)

260	Mathematics Education	ABS-232
Learning Obstacles of Fourth Grade Students in Mathematical Communication Skill of Volume and Cubes Subject Inne Marthyane Pratiwi, Siti Nuriah, Nunung Sobarningsih, Muhammad Rifqi Mahmud Universitas Islam Negeri Sunan Gunung Djati Bandung Abstract Mathematical communication skill are very important for the students of Madrasah Ibtidaiyah. Students who have good mathematical communication skill are able to express and accept mathematical ideas carefully, analytically, critically and evaluatively so they will understand mathematical concepts. This study aims to identify the learning obstacles faced by students in mathematical communication skill in the volume of cubes and beams subject. This research was part of the Didactical Design Research (DDR) conducted at one of the Madrasah Ibtidaiyah in Bandung Regency. Research participants were 13 of sixth grade students. Data collection is done by test, interview, and observation. Based on the research, we found difficulties faced by students in mathematical communication skill on volume of cubes and beams subject which are categorized into ontological, didactical, and epistemological obstacle. For this reason, further research is needed in the form of learning design to overcome the learning obstacle. Keywords: earning obstacle, madrasah ibtidaiyah, mathematical communication skill, volume of cubes and beam PermaLink | Plain Format | Corresponding Author (Inne Marthyane Pratiwi)

261	Mathematics Education	ABS-234
Mathematical Asbtraction Abilities of High School Students in Terms of Cognitive Style Anna Rachmadyana Harry, Endang Cahya M.A., Al Jupri Universitas Pendidikan Indonesia Abstract The purpose of the research carried out is to describe the classification of the level of mathematical abstraction ability in the material sequence and series in terms of the cognitive style of the students, examine the relationship between mathematical level abstractions and students cognitive styles, and find out the errors experienced by students in completing questions about mathematical abstraction ability in the sequence and series material in terms of cognitive style. This research is a descriptive study using a qualitative approach. The subject of this study was obtained by carrying out cognitive style tests using instruments MFFT (Matching Familiar Figures Test) developed by Warli (2010) and the test questions of mathematical abstraction abilities are arranged based on levels and indicators of mathematical abstraction developed by Fitriani (2018) which was attended by 31 grade XI students from one of the high schools in Bandung city. The MFFT cognitive style test results group students into 4 cognitive style groups, namely impulsive (I), reflective (R), impulsive and reflective (IR), and not impulsive and not reflective (TITR). Mathematical abstraction abilities are divided into 4 levels, level 1 perceptual abstraction, level 2 internalization, level 3 interiorization, and level 4 second level of interiorization. The results of the students mathematical abstraction ability test show that student I is at level 1 transition, level 2 complete, level 3 transitions, and level 4 transitions, and complete level in question 5. Student R is at complete level for level 1 questions, transition level for level 2 questions, complete level for level 3 and transition level for level 4, and complete level for question 5. Students IR are at the complete level for all levels 1 to level 4 and questions number 5. TITR students are at level 1 complete, level 2 transitions, complete level 3, level 4 transitions, and do not get the achievement of question 5. Linkages were found between the level of mathematical abstraction and the cognitive style of IR. Several types of errors are found when students solve mathematical abstraction questions including the category of error CE (Comprehension Error), TE (Transformation Error), PSE (Process Skill Error), and EE (Econding Error). Keywords: mathematical abstraction, sequences and series, cognitive style, student mistakes, Newmans theory PermaLink | Plain Format | Corresponding Author (Anna Rachmadyana Harry)

262	Mathematics Education	ABS-240
Effectiveness of Constructivism Based Learning Models Against Students Mathematical Creative Thinking Abilities in Indonesia; A Meta-Analysis Study Maximus Tamur (a*) , Dadang Juandi (b) a) Doctoral Program in Mathematics Education, Universitas Pendidikan Indonesia Jl. DR. Setiabudi No 229, Bandung, 40154 Indonesia *maximustamur[at]upi.edu dan maximustamur[at]unikastpaulus.ac.id b) Department of Mathematics Education, Universitas Pendidikan Indonesia Jl. DR. Setiabudi No 229, Bandung, 40154 Indonesia. dadang.juandi[at]upi.edu Abstract This meta-analysis study aims to investigate the effectiveness of the application of constructivism-based learning models to the mathematical creative thinking abilities of secondary school students in Indonesia. This study analyzes 33 studies that have been published in national and international journals from 2010 to 2019. Data were analyzed using CMA (Compherensive Meta-Analysis) software designed to determine publication bias and effect size. As a result of the study, the overall effect size was 0.884 according to the random effects model indicating that the average person ranked 13th in the experimental group, equivalent to those ranked 6th in the control group. The study was conducted by considering the variables of the study year, the level of the study school conducted, sample size and class, resulting in significant differences. Thus the application of constructivism-based learning models is very effective in improving students mathematical creative thinking abilities in Indonesia. Keywords: Creative Thinking abilities, constructivist-based learning models, meta-analysis, mathematics education PermaLink | Plain Format | Corresponding Author (Maximus Tamur)

263	Mathematics Education	ABS-245
Enhancement of Senior High School Student’s Mathematical Abstraction, Connection ability and Persistence with Generative Learning Model Muhammad Rizki Fauzi*, Nanang Priatna, Endang Cahya Mulyaning Asih Department of Mathematics Education, Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi No. 229, Bandung 40154, Indonesia. *mrizkif[at]upi.edu Abstract This study aims to investigate and analyze the enhancement of student’s mathematical abstraction, connection ability and persistence who taught by generative learning model. It employed quasi-experimental method with non-random pre-test and post-test control design. More specifically, it used the 2x3 factorial design, namely the learning factors that included Generative Learning Model and conventional teaching learning, and levels of prior mathematical ability (high, middle, and low). This study took a sample of 68 grade X (ten) students of a senior high school in Karawang, West Java. The instruments of this study consisted of mathematical abstraction test, mathematical connection test and mathematical persistence questionnaire. Quantitative data analysis were carried out by using t-test, Mann-Whitney U test, and two ways ANOVA with interaction. The results of this study show that: 1) student’s achievement and enhancement of mathematical abstraction and connection abilities who taught by Generative Learning Model were significantly higher than those of students who received conventional learning; 2) there is no interaction between learning models and prior mathematical ability toward the enhancements of mathematical abstraction and connection ability 3) Mathematical persistence of students taught by Generative Learning Model was also significantly higher than of those taught with conventional learning. Keywords: Mathematical Abstraction, Mathematical Connection, Mathematical Persistence, Generative Learning PermaLink | Plain Format | Corresponding Author (Muhammad Rizki Fauzi)

264	Mathematics Education	ABS-253
DEVELOPING A TEST FOR TESTING STUDENTS’ MATHEMATICS COMPETENCY AS PROSPECTIVE SECONDARY SCHOOL MATHEMATICS TEACHERS Awi (a*), Syahrullah Asyari (a), Muhammad Darwis M (a), Sahlan Sidjara (a), Ikhbariaty Kautsar Qadry (b) a) Department of Mathematics FMIPA Universitas Negeri Makassar, Jln. Daeng Tata, Makassar 90224, Indonesia b) Department of Mathematics Education FKIP Universitas Muhammadiyah Makassar, Jln. Sultan Alauddin No.259, Makassar 90224, Indonesia Abstract This was developmental research aimed at developing a test for testing students’ mathematics competency as prospective secondary school mathematics teachers. The test result will be the prerequisite ability which will determine mathematics students’ feasibility to step forward to the research proposal seminar to undertake their thesis. The research respondents were 32 third-year students of the mathematics department of FMIPA UNM. Within this research, the test was developed through five phases, namely: (1) devising the test specification; (2) writing down the test; (3) reviewing the test; (4) trying out the test; (5) analyzing the items of the test from both difficulty level and item discrimination. Determination of the accepted items after trying out referred to the analysis results based on item discrimination, i.e. the ability of the questions to differ students with high from low ability in mathematics. The measure of the item discrimination coefficient was from –1 to 1. The analysis results were classified into three categories, namely: accepted without revision (if the item discrimination coefficient is greater than 0.30), accepted with revision (if the item discrimination coefficient is from 0.10 to 0.29), and rejected (if the item discrimination coefficient is less than 0.10). There were 45 multiple-choice items written, tried out, and then analyzed. The analysis results showed that 21 items were accepted without revision, 17 items were accepted with revision in terms of the language construction and the difficulty level of the items, whereas 7 items the rest were rejected. Thus, 38 of the 45 items were feasible to use in testing the students’ mathematics competency. Keywords: Test, Competency, Prospective Mathematics Teacher PermaLink | Plain Format | Corresponding Author (AWI .)

265	Physics	ABS-1
Drought Potential in Cilacap Based On CCAM RCP 4.5 Rainfall Data as Input Amalia Nurlatifah(a*), Sinta Berliana Sipayung(a), Bambang Siswanto(a), Indah Susanti(a) a) Center of Atmospheric Science and Technology, National Institute of Aeronautics and Space Abstract Climate change is a change in weather patterns over a long period of time and can lead to increased frequency of hydrometeorological disasters. This study aims to see the potential for drought in Cilacap based on the results of the CCAM model projections with the RCP 4.5 scenario due to climate change. The method used is the CCAM modeling method, the validation of rainfall data from CCAM output with observation data using the correlation and RMSE methods, and determining the incidence of drought with the SPI (Standardized Precipitation Index). Based on the simulation results, rainfall data from CCAMs output in 2006-2014 showed good performance with a correlation value of 0.8 and RMSE 61 value compared with the average rainfall observation that reached 270. When this data was used as input for calculating drought conditions CCAM data is also seen as quite capable in estimating drought conditions in Cilacap when compared with data from BNPB. Therefore the CCAM data and the SPI method are quite capable of explaining the conditions of drought in Cilacap. Based on the projected data from CCAM and the SPI drought calculation method, in the period of mid-2019 to 2020 is estimated that Cilacap will be in a normal condition and there will be no drought or extreme wet conditions. Keywords: Drought; CCAM; RCP 4.5; SPI PermaLink | Plain Format | Corresponding Author (Amalia Nurlatifah)

266	Physics	ABS-3
The Sensitivity of Attenuation Impact to Bedrock PGA based on PSHA Analysis, case study: Yogyakarta Special Region, Indonesia Arifan Jaya Syahbana (a*,b,c), Khori Sugianti (c), Masyhur Irsyam (b,d), Hendriyawan (b,d), M Asrurifak (e) a) Department of Civil Engineering, Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung, Bandung, Indonesia * arifanjaya[at]s.itb.ac.id b) Center for Earthquake Science and Technologi Indonesia, Bandung, Indonesia c) Research Center for Geotechnology, Indonesian Institute of Sciences, Bandung, Indonesia d) Department of Ocean Engineering, Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung, Bandung, Indonesia e) Research Center for Disaster Mitigation, Institut Teknologi Bandung, Bandung, Indonesia Abstract Special Region of Yogyakarta is one of a big cities in Indonesia which has important meaning from the political, social, economic and cultural aspect. This area is located in a high earthquake hazard zone based on the 2017 Earthquake Hazard Map. This location also mentioned has accelerated bedrock acceleration up to 0.6g. In this study, a re-analysis of PSHA will be carried out using the OpenQuake software with the GEM database and the latest attenuation to see the number of acceleration differences generated in the bedrock. Simulation is done by making two logic tree attenuation scenarios, later called the Pusgen scenario (1) and the Cummins scenario (2). The result of this study is the first scenario will result in an acceleration greater than the second scenario. Bedrock PGA based on Pusgen scenario range from 0.431-0.720g in another hand Cummins scenarios ranges from 0.405 to 0.709g. Keywords: sensitivity; attenuation; bedrock; PGA; PSHA; Yogyakarta PermaLink | Plain Format | Corresponding Author (Arifan Jaya Syahbana)

267	Physics	ABS-6
Seismic hazard analysis of Maumere, Flores: a review of the earthquake sources Lina Handayani Research Center for Geotechnology Indonesian Institute of Sciences Jalan Sangkuriang Bandung 40135 Abstract Maumere at the north coast of Flores Island has experienced not only large earthquakes but also tsunamis. The earthquake sources in this area include thrust faults (north of the island, Timor Trough, and Sawu Basin), strike-slip fault at the west of the island, and Australian Plate subduction-related movements. In this paper, we reviewed all tectonic aspects and studies on a previous large earthquake. A thorough study of all possible sources and probability seismic hazard analysis indicated that events caused by the Flores back arc thrust has the highest possible effect to the ground attenuation in Maumere. Keywords: Seismic hazard, Flores back thrust, Maumere PermaLink | Plain Format | Corresponding Author (Lina Handayani)

268	Physics	ABS-7
DOLOMIT WONOSARI FORMATION, GUNUNGKIDUL DISTRICT, CENTRAL JAVA Dedi Mulyadi, Haryadi Permana, Solihin Puslit Geoteknologi LIPI Abstract Dolomite minerals are currently widely used for a variety of uses, including fertilizers, glass mixtures, as materials for making cement, necessary elements for making ceramics, etc. Research on the composition of dolomite in rock gaming of the Wonosari Formation, Gunung Kidul Regency, Central Java. The method used in this study is petrography and AAS. The results of the petrographic analysis showed that the presence of small amounts of dolomite while the AAS analysis also showed the presence of not too little (little) dolomite. Conclusion Dolomite contained in the Wonosari formation is not too dominant; at present, the exploitation for dolomite minerals continues to be carried out with open mining methods. Conclusions from this study Dolomite wonosari Formation is not well used both for fertilizer and cement materials because the composition is only 3% Keywords: Composition of dolomite, Wonosari Formation. dolomit percentage PermaLink | Plain Format | Corresponding Author (Dedi Mulyadi)

269	Physics	ABS-269
Effect of Mixing Times on the Characteristics of Silicone Oil Synthesized with the Addition Polymerization Process Wiendartun and Waslaluddin UNIVERSITAS PENDIDIKAN INDONESIA Abstract Abstract. Silicon Oil, which is commonly used in vitreoretinal surgery, is known as Polydimethylsiloxane (PDMS). Silicone oil is used as a substitute for vitreous humor in vitreoretinal surgery. Silicone oil is needed in Indonesia and must be produced with sufficient quality and quantity for domestic needs, currently vitroretinal surgery still uses silicone oil imported from abroad. In this study, PDMS has been synthesized using an addition polymerization process with a polymerization chain growth mechanism, with the monomer octamethylcyclotetrasiloxane, the initiator of Pottasium Hidroxida and the hexamethyldisiloxane chain terminator. The duration of mixing varied from 20 minutes, 30 minutes and 40 minutes, to study the effect of time on PDMS characteristics. The PDMS synthesis we produce is between 65.30% and 86.71% with various viscosities in the range of 900 m.Pa.s and 5000 m.Pa.s. FTIR spectroscopic measurements were found that all synthesized samples were found to have functional groups and structures similar to commercial silicon oil. UV-Vis and refractometer measurements, all samples have transmittance close to 100% and refractive index between 1.3589 and 1.4059. The effect of the length of time on the PDMS gel is on the viscosity the longer the mixing time the higher the viscosity, this mixing occurs at 170oC, stirred using a magnetic stirrer with 300rpm and the concentration of 1M Pottasium Hydroxide. In this study the propagation stage to form a gel began to form in 20 minutes. Keywords: addition polymerization, chain growth mechanism, polydimethylsiloxane PermaLink | Plain Format | Corresponding Author (Waslaluddin Waslaluddin)

270	Physics	ABS-17
THE BIOMASSED COAL FERMENTED (BCF) BRIQUETTE AS AN ALTERNATIVE FUEL Dyah Dyah Marganingrum (a), Lenny Marilyn Estiaty (a), Chandra Irawan (b), Hidawati (a) a) Reserach Centre for Geotechnology – Indonesian Institute of Sciences b) Kelompok Studi Media Energi Nusantara Abstract Bottom ash (BA) is waste categorized as B3 and requires special handling and costs. BA become as an interesting issue since the coal using increase in various industries as a fuel. In another case, municipal solid waste (MSW) generation become the environmental problem in the urban area. This paper aims to utilize these two wastes to products and solution of environmental problems as well. The method used in this study is briquetting from BA and fermented of MSW called Biomassed Coal Fermented (BCF) briquettes. The formulations used 60% BA and 40% MSW. The BCF briquettes were tested in boiler 1 which fixed bed type at the kind textile industry. The results showed that with 10% substitution of BCF briquettes for coal use, combustion efficiency increased by 48%. The measurements of air emissions showed a value below of the air quality standard for particulate, SO2, and NO2. When compared with boiler 2 which is without substitution (100% using coal) the particulates and NO2 increased 28% and 2% respectively then SO2 decreased 67%. This interim trial showed the potential of BCF briquettes can be an alternative fuel while reducing the generation of BA and MSW. Keywords: air quality standards; bottom ash; emission; fermentation; municipal solid waste PermaLink | Plain Format | Corresponding Author (Dyah Marganingrum)

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