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151	Mathematics Education	ABS-109
An analysis on social envirovment as external factor affecting students achievement of mathematics program samudra university Fadilah(a)*, R Priyanda(b), and R Amalia(c) a)Department Pendidikan Matematika, Universitas Samudra, Jl. Meurandeh, Langsa Lama, Kota Langsa Aceh 24354, Indonesia *fadilah[at]unsam.ac.id b)Department Pendidikan Matematika, Universitas Samudra, Jl. Meurandeh, Langsa Lama, Kota Langsa Aceh 24354, Indonesia c)Department Pendidikan Matematika, Universitas Samudra, Jl. Meurandeh, Langsa Lama, Kota Langsa Aceh 24354, Indonesia Abstract This study are the results of the study used in the third semester students and V Mathematics Education FKIP Samudra University academic year 2018/2019. Data collection used was questionnaire/questionnaire and interview. Approach and concept in this research using variable annotation with SPSS version 21. Interpretation of result of factor rotation indicates the formation of 3 factors together (main factor). The first to the third external factors that ranked first in the factors that are developing the results of the study of mathematics students FKIP Samudra University in sequence is the community environment, school buildings, and campus environment Keywords: Analysis- Social Envirovment- External Factor Share Link | Plain Format | Corresponding Author (Fadilah, S.P., S.Pd.,M.Pd)

152	Mathematics Education	ABS-111
Designs of Faded Example to Increase Problem Solving Skills and Procedural Fluency in Algebraic Division Ibrohim Aji Kusuma (a*), Endah Retnowati (b) a)Program Pascasarjana, Universitas Negeri Yogyakarta, Jl. Colombo No. 1, Yogyakarta 55281, Indonesia *ibrohimaji.2018[at]student.uny.ac.id b)Program Studi Pendidikan Matematika, Universitas Negeri Yogyakarta, Jl. Colombo No. 1, Yogyakarta 55281, Indonesia Abstract When solving mathematics task, students are required to apply problem solving skills and promote procedural fluency. A role of learning instructions is essential when facillitating students to develop those abilities effectively. In addition, the limitation of working memory when proccessing information and the function of long-term memory where the information stored are required to consider to facilitate better learning. Cognitive Load Theory (CLT) suggests learning instruction should be developed in manner of which suitable to human cognitive architecture. Faded-example, an instruction based on this theory proposed a smooth mechanism when solving several tasks as well as applying the most effective procedure. Faded-example begins with a fully guided-task (worked example) and then gradually reduces step-by-step solutions within problems become a fully no guidance task (problem-solving). Theoritically, this strategy may help students to foster their problem-solving skill and procedural fluency step-by-step. Designs of faded example (forward and backward procedures) and its instructional implication for learning algebraic division are discussed. Keywords: Faded example, Problem solving skills, Procedural fluency, Algebraic division Share Link | Plain Format | Corresponding Author (Ibrohim Aji Kusuma)

153	Mathematics Education	ABS-113
A Systematic Literature Review on Developing Students Statistical Literacy Skills Aisyah Mohd Aziz and Roslinda Rosli Universiti Kebangsaan Malaysia Abstract . Statistical literacy is crucial for preparing students to become part of a modern society which is continuously bombarded with arguments that are derived from data-based decisions. In this regard, the teaching of statistics is a fundamental aspect of the mathematics curriculum at any educational level. Therefore, this study presents a systematic literature review of 36 articles which examine statistical literacy skills among students. Specifically, this study focused on identifying teaching methods that influence the development of statistical literacy among students. It was found that four dominant factors influence the development of statistical literacy among students: the learning environment, students^ attitude, teaching method, and students^ basic knowledge. Some studies have focused on students^ demographic factors, including their age, gender, and grade level- however, there are no conclusive findings on their role in influencing the development of statistical literacy. The study also revealed the three most common teaching methods in statistical literacy studies were teacher-centered teaching methods, student-centered teaching methods, and materials-based teaching. Out of these methods, materials-based teaching was the most commonly used to develop statistical literacy among students. Based on the findings, implications for teaching and learning statistics were discussed Keywords: Statistical literacy, factors, teaching method, 21st century, big data Share Link | Plain Format | Corresponding Author (ROSLINDA ROSLI)

154	Mathematics Education	ABS-115
Profile of Mathematical Ability of Junior High School Student in Cirebon Based on TIMSS Standards M Munaji, M I Setiawahyu Universitas 17 Agustus 1945 Cirebon, Jl. Perjuangan No. 17 By Pass Cirebon 45131, Indonesia Abstract Abstract. This result of research on TIMSS scores of Indonesian students in 2011 puts it at the bottom. And until now there are still many references of mathematics students and mathematics researchers in Indonesia. However, there are no results of research on the position where students in the city of Cirebon currently in the TIMSS score. The method of the reasearch is survey method by taking a random sample of 491 students taken from eighth-grade students of public and private schools showed the average TIMSS score of students who answered correctly from the sample tested reached 58% with a standard deviation of 8. The average of student correct answer in Cirebon higher than national average or international average correct answer in all level at TIMSS in 2011, thus low level, intermediate level, high level and advance level. However, the mathematical ability of students in the city of Cirebon still needs to be improved because in intermediate level, high level, and advance level still less satisfactory. In gender differences perspective, math ability female student better than math ability of male students for all level at TIMSS in 2011. Keywords: Mathmetical ability, TIMSS, Content domain, Cognitive domain Share Link | Plain Format | Corresponding Author (Munaji Munaji)

155	Mathematics Education	ABS-116
Analysis Local Instruction Theory Mathematical Set in Realistic Mathematics Education for Developing Mathematical Understanding Abilities for Junior High School Students During COVID-19 Taufiqulloh Dahlan (1*), Darhim (2), Dadang Juandi (3), Nia Gardenia (4) , and Thesa Kandaga (5) Doctoral Student in Mathematic Education, Universitas Pendidikan Indonesia, Lecturer in Mathematic Education, Unversitas Pasundan, Bandung, Indonesia (1*),(5) , Mathematic Education, Universitas Pendidikan Indonesia, Bandung, Indonesia (2),(3), Mathematic Education, Universitas Indraprasta PGRI Jakarta, Indonesia (4) Abstract A number of studies have documented students difficulties in completing mathematics set material and the availability of teaching materials that lack training of students in active thinking, which results in high errors of students in solving mathematical set problems seen from indicators of mathematical understanding ability. Coupled with the difficulty of learning during the COVID 19. Therefore, this research aims to design and develop learning trajectories in mathematics set material which is a set of activities arranged systematically using Realistic Mathematics Education (RME) learning. This design is called the Local Instruction Theory Trajectory (LIT) in the RME approach. The research method used is experimental research design, and resrospective analysis. The research subjects in teaching experiment phase 1 were students of class VIII MTs. Negeri 4 Sumedang and subjects in teaching experiment stage 2 were students of MTs. Kirisik, Sumedang. This study describes how the LIT design of the mathematical set in the developed RME approach contributes to developing students^ mathematical understanding abilities with advanced analysis of the horizontal and vertical mathematical processes. The final result of learning where more than a number of students have been able to bring up the steps in the mathematical process. Keywords: Keywords: Design Research, Local Instruction Theory, Mathematics Set, Realistic Mathematics Education, Mathematical Understanding Ability, Horizontal Mathematics, and Vertical Mathematics. Share Link | Plain Format | Corresponding Author (Taufiqulloh Dahlan)

156	Mathematics Education	ABS-121
Students^ Mathematical Communication in Teams Games Tournaments (TGT) Learning Model on Trigonometry Topic Nurul Kholidah(a), Abd Qohar(a*) a)Mathemathics Department, Universitas Negeri Malang, Jl. Semarang No. 5, Malang 65145, Indonesia *abd.qohar.fmipa[at]um.ac.id Abstract This study aims to observe the result of students^ mathematical communication in a Teams Games Tournament (TGT) type cooperative learning model. This study uses a qualitative descriptive method in which the result of the observation and investigation of the students^ mathematical communication will be described. This research subjects were the first semester college students of class A in school year 2019/2020. There were 30 students who were taking the Trigonometry learning material in the Mathematics Education study program of Math and Science Faculty in Universitas Negeri Malang. The learning process was done by applying the TGT type cooperative learning method. The results of this research showed that the learning model had a positive influence on most of the students^ mathematical communication, especially on their oral and written mathematical communication aspects. On the oral aspect, on average, the students had a good communication skill with several indicators as follows: grammatical skills- sociolinguistic skills- and strategical skills. The students were expected to have a mathematical thinking and reasoning skills. Whereas on the written aspect, the indicators were as follows: interpreting mathematical ideas rationally, changing mathematical problems into mathematical models, and expressing mathematical ideas in the form of a description. From the results of this study, it was obtained that most of the students had good written mathematical communication skills. It can be concluded that the TGT learning model had a positive influence on the students^ mathematical communication skills. Keywords: Mathematical communication- Teams Games Tournament (TGT)- Trigonometry Share Link | Plain Format | Corresponding Author (Abd Qohar)

157	Mathematics Education	ABS-127
Profile of Mathematical Ability of Junior High School Student in Cirebon Based on TIMSS Standards Munaji, M I Setiawahyu Universitas 17 Agustus 1945 Cirebon Abstract This result of research on TIMSS scores of Indonesian students in 2011 puts it at the bottom. And until now there are still many references of mathematics students and mathematics researchers in Indonesia. However, there are no results of research on the position where students in the city of Cirebon currently in the TIMSS score. The method of the reasearch is survey method by taking a random sample of 491 students taken from eighth-grade students of public and private schools showed the average TIMSS score of students who answered correctly from the sample tested reached 58% with a standard deviation of 8. The average of student correct answer in Cirebon higher than national average or international average correct answer in all level at TIMSS in 2011, thus low level, intermediate level, high level and advance level. However, the mathematical ability of students in the city of Cirebon still needs to be improved because in intermediate level, high level, and advance level still less satisfactory. In gender differences perspective, math ability female student better than math ability of male students for all level at TIMSS in 2011. Keywords: Mathmetical ability, TIMSS, Content domain, Cognitive domain Share Link | Plain Format | Corresponding Author (Mochamad Iman Setiawahyu)

158	Mathematics Education	ABS-129
Analysis of Student Literacy Statistics Viewed from the Impulsive and Reflective Cognitive Style Suhana(a*), Tatang Herman(b), Siti Fatimah(b) a*)Program Studi Pendidikan Matematika, Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia *al_mujahid2009[at]yahoo.com b)Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia Abstract This research was motivated by the low statistical literacy ability of Madrasah Tsanawiyah students. The focus of this research was to obtain to describe the statistical literacy ability of student viewed from impulsive and reflective cognitive styles in one of the MTs in Sumedang Regency, West Java, Indonesia. The participants of this research were 33 students of 9th grade. The research methodology used was a qualitative approach using instruments consisting of Watson statistical literacy tests, Warli cognitive style tests, and semi structured interviews. The result showed that there was a relationship between students statistical literacy abilities and cognitive styles. Students with reflective cognitive styles were at the critical mathematical level, while students with impulsive cognitive styles were at the informal level. Reflective cognitive style students were more careful in answering and considering answer well, while students who where impulsive cognitive style tend to rush in answering and lack critical thinking. Based on this research teachers were expected to able to accommodate the cognitive style of each student in teaching and learning activities. Keywords: Impulsive and Reflective Cognitive Style, Statistical Literacy, Madrasah Tsanawiyah Students Share Link | Plain Format | Corresponding Author (Suhana S.Pd)

159	Mathematics Education	ABS-134
Preservice Teachers^ Belief on Nature of Mathematics and Mathematics Teaching and Learning: A Quantitative Study Sadrack Luden Pagiling (a*), Markus Palobo (a), Dian Mayasari (a) a) Jurusan Pendidikan Matematika,Universitas Musamus Merauke, Jalan Kamizaun Mopah Lama, Merauke 99611, Indonesia *pagiling_fkip[at]unmus.ac.id Abstract A quantitative study to investigate preservice teachers^ beliefs in mathematics and mathematics teaching and learning. The participants were 103 preservice mathematics teachers who were studying at the Musamus University of Merauke. The TBTP questionnaire was used to measure the beliefs of preservice teachers. The results showed that there were differences in the beliefs of preservice teachers when teaching in classes dominated by high ability students and low ability students. Preservice teachers tend to have platonist beliefs when teaching in high ability classes and when teaching in low ability classes preservice teachers have instrumentalist beliefs. Most preservice teachers have instrumentalist beliefs in mathematics. The implications of the study provide recommendations for teacher educators to change the beliefs of preservice mathematics teachers into problem-solving views. Keywords: Preservice teacher, belief, mathematics ability Share Link | Plain Format | Corresponding Author (Sadrack Luden Pagiling)

160	Mathematics Education	ABS-136
Implementation of Two Stay Two Stray (TSTS) Learning Model to Improve College Students Learning Activities on Geometry Course Pramita Respati(a), Abd Qohar(a*) a) Mathemathics Department, Universitas Negeri Malang, Jl. Semarang No. 5, Malang 65145, Indonesia *abd.qohar.fmipa[at]um.ac.id Abstract College students^ learning activities need to be improved nowadays. In this study, based on the results of research involving 34 college students, there were only 5 students who actively expressed their opinions. This study is addressed to improve the students^ learning activities in Introduction of Geometry: Trapezoidal and Proportion. Learning model used was Two Stay Two Stray learning model. The characteristics of this learning model is suitable to improve students^ learning activities. Research subjects in this study was 34 college students of Mathematics Education Department Offering A school year 2019/2020. This study used Classroom Action Research (CAR) by using data collection tool in the form of Student Activity Observation Sheet. Based on the observation of classically done data analysis, it can be concluded that there were improvements in students^ learning activities. In Oral Activities, the activeness percentage of Cycle I was 83.82%, meanwhile the activeness percentage of Cycle II was 90.90%. In Writing Activities, the activeness percentage of Cycle I was 83.82%, meanwhile the activeness percentage of Cycle II was 91.17%. In Emotional Activities, the activeness percentage of Cycle I was 82.35% and the activeness percentage of Cycle II was 86.02%. Therefore, implementation of Two Stay Two Stray learning model is proven to improve college students^ learning activities on geometry course materials. Keywords: Two stay two stray- Learning activities- learning model- geometry Share Link | Plain Format | Corresponding Author (Abd Qohar)

161	Mathematics Education	ABS-138
Symbol sense characteristics for designing mathematics tasks Al Jupri, Ririn Sispiyati Universitas Pendidikan Indonesia Abstract Symbol sense, an analogy of number sense in the symbolic world of mathematics, is an ability to give meaning to symbols, expressions, and formulas that involves many characteristics, including friendliness with symbols, an ability to examine symbol meanings, and skills to manipulate symbolic expressions. In algebra education, the characteristics of symbol sense are usually used, for instance, for designing symbolic algebra tasks, but are a bit rare for designing mathematics tasks in general. Therefore, this study aims to use symbol sense characteristics for designing mathematics tasks for secondary school students. To do this, using a design research method, we conducted a literature study to collect characteristics of symbol sense and to see possibilities of designing mathematics tasks in general. Next, we designed mathematics tasks according to the symbol sense characteristics. Finally, we provided possible responses of students for the designed tasks. The results of this study included six types of tasks according to the characteristics of symbol sense, including tasks on symbolic problems and word problems--which require translation into symbolic problems. In addition, we provided predicted responses to examples for each type of the tasks and suggestions for use in the learning and teaching process. For further investigation, we recommend to use the set of designed tasks for assessing student symbol sense ability. Keywords: Symbol sense- algebra education- mathematics education- task design Share Link | Plain Format | Corresponding Author (Al Jupri)

162	Mathematics Education	ABS-140
Literature Study: The Role of Abstraction Ability to Strengthen Students Early Knowledge in Mathematics Learning S Nurjannah (a*) and Kusnandi (a) a) Departemen Pendidikan Matematika, Fakultas Ilmu Pendidikan Matematika dan Ilmu Pengetahuan Alam, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia *sitinurjannah543[at]upi.edu b)Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia Abstract This study aims to determine the extent of the role of the ability of abstraction to strengthen students early knowledge in learning mathematics. This type of research is a literature study. The type of data used is secondary data from articles related to the study. Data collection methods are by reading the appropriate arithmetic study, then classified more specifically. Next identify the role of the ability of abstraction to strengthen students early knowledge in learning mathematics. From the results of identification then analyzed through the process of categorizing and classifying. The final step is to describe the results of the literature review and conclude it. The results of this paper indicate that the ability of abstraction is very important because it is closely related to the inculcation of basic mathematical concepts that are used as early knowledge or prerequisites of students in learning new material in mathematics learning and students can demonstrate their mathematical ideas, make connections between concepts and can manipulate objects that are abstract. Keywords: Abstraction Ability, Students Early Knowledge Share Link | Plain Format | Corresponding Author (Siti Nurjannah)

163	Mathematics Education	ABS-142
Blended learning based on ebook integrated youtube in learning mathematics Fitriani, S Fatimah and T Herman Universitas Pendidikan Indonesia Abstract This study aims to develop an blended learning based on Ebook integrated Youtube in mathematics learning geometry material that is valid, practical and effective and to determine students readiness for the use of blended learning at the E-learning stage in mathematics learning. This research is a development research design development model used is the Analyze, Design, Development, Implementation and Evaluation model. And to see the readiness of students towards the use of Blended Learning at the E-learning stage the researchers used a type of qualitative research using descriptive research methods. This research was conducted for high school students in Negeri 1 Langsa City. The instruments used in this study were (1)Plans for implementing learning and Ebooks integrated with Youtube (2)expert validation sheets, (3)teacher and student observation sheets (4)tests and (5)questionnaire. The results of the research show that developing a blended learning based on Ebook integrated Youtube in mathematics learning geometry materia meets valid, practical and effective criteria. The results of the students readiness questionnaire towards the use of blended learning in the E-learning stage in mathematics learning showed results on an average indicator with a value of 72.69% with a good category. Keywords: blended learning, ebook, youtube, pembelajaran matematika Share Link | Plain Format | Corresponding Author (Fitriani Fitriani)

164	Mathematics Education	ABS-148
The New Face of Education During the Pandemic Covid-19 Dian Mayasari (a*), Markus Palobo (a), Sadrack Luden Pagiling (a) a) Jurusan Pendidikan Matematika, Universitas Musamus Merauke, Jl. Kamizaun Mopah Lama, Merauke 99611, Indonesia *mayasari_fkip[at]unmus,ac,id Abstract The aim study was therefore designed to understand the student^s perspective, attitudes, and readiness about online classes being conducted at the University level. An Observational, Descriptive study was conducted. The data was collected using a Questionnaire. The present study was carried out amongst 68 students. After analyzing the results, it was found that 25% of the students liked studying through online classes. The most common reason (30%) as to why the students like studying online were that the study location becomes flexible, and they can study anywhere they want. Lack of internet network activity was the most common issue (56%) of online classes, as reported by the students. Most of the students were found satisfied with the content and procedure of online teaching. About 30% of the students reported that they prefer their lecture being delivered through a PPT with an audio recording. The present study that was conducted among college students revealed that maximum students are in favor of studying through online classes, but they feel that there is a lack of co-curricular activities in the online mode of conducting classes. As the students are in favor of online classes, such classes must be continued with some interventions. Keywords: New Face, During Pandemic, Covid-19 Share Link | Plain Format | Corresponding Author (Dian Mayasari)

165	Mathematics Education	ABS-150
The Rectangle Circumference Didactical Design based on Singing Playing Analyzing Discussing Evaluating (SPADE) Learning Model P S Agustin (a*), E Nuraeni (b), O H Pranata (c), I F Apriani (d) Universitas Pendidikan Indonesia Kampus Tasikmalaya Abstract This research is motivated by the ability of students on their low results of preliminary studies related to the concept of a rectangular circumference and their learning obstacles. The purpose of this study is to describe students^ learning obstacle on the material the rectangle circumference, didactical design of the concept of a rectangular circumference based on the SPADE learning model to overcome learning obstacle. The implementation of the rectangular didactical design circumference concept based on the SPADE learning model, students^ responses to the didactic design the rectangular circumference concept based on the SPADE learning model. The method used is a qualitative Didactical Design research model- consist of the three stages, namely- prospective analysis, metapedadactic analysis, and retrospective analysis. This study conducted in SDN Cibogo class IV. The data collection is using the description of the concept of the circumference of a rectangle. The results of the study are teaching materials in the form of Student Activity Sheets and lesson plan, then it will be developed as an alternative that can be used in learning in primary schools and used to overcome learning obstacle in mathematics learning in class IV elementary schools on the rectangle circumference. Keywords: Circumeference- Didactical Design- Rectangle- SPADE Share Link | Plain Format | Corresponding Author (Hj. Epon Nuraeni L., M.Pd.)

166	Mathematics Education	ABS-152
Investigation of Watson-Glaser Critical Thinking Skills of Junior High School Students in Solving Mathematical Problems Aiyub1,2*, D. Suryadi2, S. Fatimah2, Kusnandi2 1Departemen Pendidikan Matematika, Universitas Islam Negeri Ar-Raniry Banda Aceh, Jl. Syech Abdul Rauf Darussalam, Banda Aceh, Indonesia 2Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia Abstract Abstract. This study aims to: (1) describe the critical thinking skills of junior high school students in solving mathematical problems and (2) identify the components of students essential sub-skills of thinking in assumptions, argument evaluation, deduction, information, and inference. This is a descriptive study with a qualitative approach. Data collected through tests and interviews, triangulation is done by comparing the test and interview. This study involved eight research subjects taken by random sampling from class VII one of the junior high schools in Pidie Jaya Regency. The test used in this study consisted of eight problems representing five critical thinking skills sub-skills. The results of data collection analyzed through data reduction, data display, and conclusion drawing. The results showed that: (1) junior high school students critical thinking skills were in a low category- (2) deduction, information, and inference are the lowest critical thinking sub-skills mastered by students compared to other critical thinking sub-skills. Keywords: Investigation, Critical Thinking skills, Watson-Glaser, Junior High School Students, Problem Solving, Mathematical. Share Link | Plain Format | Corresponding Author (Aiyub Aiyub)

167	Mathematics Education	ABS-154
Student^s Learning Obstacle on Understanding the Concept of Prism Surface Area Yushilatu F Aziiza1*and D Juandi2 1Departemen Pendidikan Matematika, Fakultas Ilmu Pendidikan Matematika dan Ilmu Pengetahuan Alam, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia 2Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia Abstract This study was a preliminary study to develop a didactic design of the concept of a prism surface area. This study aimed to identify the learning obstacle experienced by students on the material of a prism surface area. The learning obstacle was obtained based on the ability test of the respondents, interviews, and documentation to students who had studied the material of the prism surface area. The method used was a qualitative method with data triangulation. This study involved 52 students in the 9th grade at one of Junior High Schools in West Bandung Regency and a teacher as a participant. The learning obstacle found in this study were an ontogenic obstacle, epistemological obstacle, and didactical obstacle. The ontogenic obstacle found was that students had difficulty in determining the names and elements of the prism, in which the difficulty was caused due to forgetfulness, doubt, and misconception of the prism surface area. The epistemological obstacle found was that students tended to memorize the definitions and formulas of the concept of the prism surface area, so they did not understand the concept as a whole. The didactical obstacle found was that the learning process was procedural and did not consider the difficulties and misunderstandings experienced by students while learning, as well as the lack of experience to construct geometric shape models, such as prisms. Keywords: Learning obstacle, prism surface area, geometric shape, learning obstacles, mathematical understanding Share Link | Plain Format | Corresponding Author (Yushilatu Felayati Aziiza)

168	Mathematics Education	ABS-155
Mathematics Teachers^ Perception of Learning Models Associated with High School Students^ Critical Thinking Skills Desy Eka Puspito Rini, Sufyani Prabawanto Mathematics Education Department, Universitas Pendidikan Indonesia Abstract Critical thinking skills must be included in the classroom learning process since it is an important aspect of 21st century learning. This study was intended to investigate high school Mathematics teachers^ perception of the learning models associated with students^ critical thinking skills. This study was conducted through a survey and the respondents were 44 Mathematics teachers from various high schools in several cities in Indonesia. Random sampling technique was employed to decide the subjects of the study. The research instrument used was a questionnaire and it was distributed by using Google Form. The data were then analyzed quantitatively and qualitatively. The results revealed that high school Mathematics teachers recognized various innovative learning models. Moreover, the teachers had a positive perception of critical thinking implementation in learning. They took the learning model which was appropriate to develop high school students^ critical thinking in learning Mathematics. Most teachers chose and applied problem-based learning models to improve high school students^ critical thinking skills. Keywords: Critical Thinking, Learning Models, Mathematics Teachers^ Perception Share Link | Plain Format | Corresponding Author (Desy Eka Puspito Rini)

169	Mathematics Education	ABS-158
The development of video analysis instrument to determine teachers character in opening lessons in terms of its voice utterances Yosef Boli Gromang, Marcellinus Andy Rudhito Universitas Sanata Dharma Abstract This study aims to develop a valid and reliable video analysis instrument to determine teachers^ character in opening lesson in terms of the its utterances and produce video analysis on micro learning that will be used in training related to artificial intelligence. The type of research used is research and development. The subject of this research is the micro teaching video of class E students^ batch 2019, Mathematics Education Study program at Sanata Dharma University. The product of this research is a video analysis instrument to find out the character of the prospective teachers such as confidence, enthusiasm, and happiness in terms of voice utterances. This study uses the ADDIE research model. The results show that the video analysis instrument has validity value of 4.80 which means it^s very valid, video analysis instrument to find out the enthusiastic character has a value of validity 4.70 which means it^s very valid, video analysis instrument to find out the character of happiness has validity value of 4.60 which means it^s very valid, the practicality of the developed video analysis instrument meets the required criteria with a practicality value of 4.3125, and overall, the video analysis instrument developed belongs to an effective category Keywords: video analysis instrument, micro teaching, character, confidence, enthusiasm, happiness Share Link | Plain Format | Corresponding Author (Yosef Boli Gromang)

170	Mathematics Education	ABS-159
The Correlation of students^ mental rotation and spatial visualisation abilities Khaluka Ahsana Fitri*, Tatang Herman Program Studi Pendidikan Matematika, Universitas Pendidikan Indonesi Jl. Dr. Setiabudi No.229, Isola, Kec. Sukasari, Kota Bandung, Jawa Barat 40154 Abstract Spatial ability is one of ability that is able to help student to solve their daily life problems and supports the others knowledge such as mathematics. This ability is constructed by many components such as mental rotation, spatial orientation, spatial visualization, etc. But some of them have not researched well. Many researchers did research for both mental rotation and spatial visualization independently, although both of them influence student mathematics achievement. In this study, we examined the correlation between students^ mental rotation and spatial visualization abilities. There were 57 students participated in this study. We examined both of ability using 10 questions each during 30 minutes. We found that there was the significant correlation between students^ mental rotation and spatial visualization ability. For further research, we suggest to do the research with wider domain in for this topics, suchh as spatial orientation. Keywords: Mental rotation, Spatial Visualization Share Link | Plain Format | Corresponding Author (Khaluka Ahsana Fitri)

171	Mathematics Education	ABS-162
Increased Mathematical Relational Understanding Ability and Self Regulated Learning of Haigh School Students through Edmodo Online Learning S Nurjanah1*, E C Mulyaning2 , and E Nurlaelah2 Indonesian University of Education Abstract This study aims to analyze and improve the relational mathematical learning abilities and independent learning of students who obtain Edmodo and Google Classroom learning which is reviewed with KAM. This type of research is a quasi-experimental design. The research sample is students of class X MIPA 1 and 2. Data collection techniques with purposive sampling technique. The instrument used consisted of tests and questionnaires. The results showed that 1) Overall, the achievement and improvement of the mathematical relational understanding ability (KPRM) of students who obtained the Edmodo learning were no higher than students who received Google Classroom learning, 2) a. Viewed from the high KAM category, accepted and improved, the KPRM of students who received the Edmodo learning was no higher than students who obtained Google Classroom learning, b. Judging from the moderate KAM category, the achievement and improvement of the KPRM of the students who received the Edmodo learning were not significantly higher than students who obtained Google Classroom learning, 3) Overall, independent learning achievement arranged by students who learned Edmodo learning was not significantly higher for students who received Google Classroom learning, and 4) A significant relationship is obtained between KPRM and students^ self-regulated learning in Edmodo learning. Keywords: Mathematical Relational Understanding Ability, Self Regulated Learning, Edmodo Share Link | Plain Format | Corresponding Author (SITI NURJANAH)

172	Mathematics Education	ABS-165
The Relationship between Mathematical Problem Solving Ability and Self Regulated Learning for Students of Class X of Gamping 1 High School Academic Year of 2019/2020 S Nurjanah1*, E C Mulyaning2 , and E Nurlaelah2 Indonesian University of Education Abstract This study aims to analyze the relationship between mathematical problem solving abilities and students^ self regulated learning. This type of research is correlation research. The population of this research is class X students and the research sample is students of class X of MIPA 1 and MIPA 2 with selected purposive sampling. The instruments used were tests and questionnaires. The data collection technique used in this study is the correlation test using the Pearson Product Moment test. The results showed that there is a significant relationship between KPMM and SRL grade X students of Senior High School of Gamping 1 in the academic year of 2019/2020. Keywords: Mathematical Problem Solving Ability and Self Regulated Learning Share Link | Plain Format | Corresponding Author (SITI NURJANAH)

173	Mathematics Education	ABS-166
Mobile learning and its effectiveness in mathematics Y Yosiana (1), D Djuandi (2), and A Hasanah (2) (1) Program Studi Pendidikan Matematika, Sekolah Pasca Sarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia (2) Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia Abstract Mobile Learning is a development approach in distance learning. Extensive access to all mobile devices and unlimited learning opportunities for space and time, making mobile learning a critical role for the learning process. The purpose of this study is to determine how the characteristics of effective mobile learning based on the results of previous studies and to get an overview of the effectiveness of mobile learning in mathematics in senior high school. The method used in this study is an evaluative survey method with a library research and field surveys. This study involved 75 eleventh grade students in one of the senior high schools in West Bandung District. The instruments used are questionnaires and interviews. Statistical analysis results show that the effectiveness of mobile learning on math learning is at a middle level. Based on the results of the survey can be concluded that the implementation of mobile learning on learning is an effective way of delivering mathematical content and able to impart self-reliance for students in enhancing the ability of understanding the subject of his studies. Keywords: mobile learning, distance learning, mobile application, smartphone Share Link | Plain Format | Corresponding Author (Yosa Yosiana)

174	Mathematics Education	ABS-169
The effectiveness of blended learning on students critical thinking skills in mathematics education: A literature review Yovika Sukma (1*) and Nanang Priatna (2) (1) Mathematics Education Study Program, School of Postgraduate, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia (2) Mathematics Education Department, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia *yovikasukma[at]upi.edu Abstract Critical thinking skills (CTS) is one of the required competencies in the 21st century. Using technology in this era is a common thing including in education. One of the learning methods assisted by technology is blended learning. In this study, the effectiveness of blended learning on students^ CTS will be analyzed. The method used in this study was a literature review. There were view steps to investigate the effectiveness of blended learning on students^ CTS namely providing the definition of blended learning, finding information about essential elements in blended learning, then synthesizing some previous studies on the implementation of the method to improve students^ CTS and connecting the studies with blended learning. Based on the literature review result, the implementation of blended learning in Mathematics had the potential to improve students^ CTS. This study could provide an overview of the problems and opportunities to implement blended learning in schools. Keywords: Blended learning- Critical thinking skills- Mathematics Share Link | Plain Format | Corresponding Author (Yovika Sukma)

175	Mathematics Education	ABS-172
The Implementation of Direct Instruction assisted by Incomplete Handout to Increase Conceptual Understanding of Student Grade XI for Topic Composition and Inverse Function in one of West Jakarta s Senior High School Julyantho Tunde (a), Tanti Listiani (b*) a) Sekolah Lentera Harapan, Jl. Pacuan Kuda No. 5, Rantepao, Toraja Utara, Sulawesi Selatan 91831, Indonesia, b) Departemen Pendidikan Matematika, Universitas Pelita Harapan, Jl. M. H. Thamrin Boulevard 1100 Lippo Village Tangerang 15811, Indonesia Abstract Facing industry 4.0 in the world of education is the responsibility of the teacher in preparing students well. One of them is to build their understanding of learning at school. Mathematics as one of the subjects that always exists in every level of education is very helpful for students in developing systematic and critical thinking, this is in accordance with the needs of students in industrial age 4.0. However, mathematics also has sufficient conditions, namely the need for an understanding of mathematical concepts. The reality found in schools in this study is the understanding of students low concepts. Therefore, this study aims to improve the understanding of student s concepts through the application of Direct Instruction assisted by incomplete handouts in the topic of composition and inverse function. The research model used is Class Action Research according to Pelton. The research subjects were 21 students of grade XI in one of the West Jakarta High Schools. The data sources used are observation sheets and test sheets. Based on the results of the data analysis, it can be concluded that the implementation of Direct Instruction assisted by Incomplete Handouts can improve student s conceptual understanding. Keywords: Direct Instruction- Incomplete Handout- Conceptual Understanding Share Link | Plain Format | Corresponding Author (Tanti Listiani)

176	Mathematics Education	ABS-174
Student Visualization in Solving Geometry Problem: The Case of Reflection Della Yurmalia, Tatang Herman Departemen Pendidikan Matematika, Sekolah Pascasarjana Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No.229, Bandung 40154 Departemen Pendidikan Matematika, Sekolah Pascasarjana Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No.229, Bandung 40154 Abstract Visualization is a mental act representing a visual information. In solving geometry problem, we need visualization to identify and illustrate the information. This study aimed to analysed student visualization in solving the reflection problems. We studied one of high school students at grade eleven who is a female olympian. There were three step in this study. First, we chose two reflection problems. Next, we interviewed her by semi structure interviewed. Finally, we analysed student spatial visual comparing to types of visualization by Presmeg. We found that she has two types of visualization that are pattern imagery and kinaesthetic imagery. In the future, we can design instructional tasks that are convenient for this visualizer. Keywords: visualization, geometry, reflection Share Link | Plain Format | Corresponding Author (Della Yurmalia)

177	Mathematics Education	ABS-183
Analysis mathematical communication skill of students in virtual classroom during the Covid-19 pandemic reviewed from personality types of guardian and idealist I D Mulyastuti(a*), Budiyono(a), and D Indriati (a) a) Postgraduate School of Mathematics Education, Universitas Sebelas Maret, Jl. Ir. Sutami No. 36, Surakarta 57126, Indonesia *indahdwimulyastuti[at]gmail.com Abstract SarsCov2 for Covid-19 provides challenges to education in Indonesia. School activity that was originally face to face, has to be replaced by virtual class for all subject include math. Virtual class is more challenging than offline class. Different personality types affect the way they communicate, learn, and understand in virtual class. The objective of this study is to analyze the mathematical communication skills of student in virtual class during the Covid-19 pandemic in terms of guardian and idealist personality types based on David Keirsey^s personality dimension. The subject of this study consisted two junior high school student in Grobogan, Central Java. The sample was taken by purposive sampling. The triangulation techniques was used to collect the data by comparing the result of test about mathematical communication skill and the result of online interview. The result of this study showed that student with guardian personality has better mathematical communication skill than idealist personality in this Covid-19 pandemic. Keywords: guardian personality, idealist personality, mathematical communication Share Link | Plain Format | Corresponding Author (Indah Dwi Mulyastuti, S.Pd.)

178	Mathematics Education	ABS-185
Student Spatial Visual in Geometry: The Case of Gender Deferences Della Yurmalia, Aan Hasanah Departemen Pendidikan Matematika, Sekolah Pascasarjana Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No.229, Bandung 40154 Departemen Pendidikan Matematika, Sekolah Pascasarjana Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No.229, Bandung 40154 Abstract Spatial Visual, a mental representation in depicting visual information, is one of important ability in solving geometry problems. This study aimed to investigated student spatial visual ability and analysed it by gender. A total of participant involved in this research is 30 junior high school students at grade seven. There were three step in this research. First, we chose two reflection quenstions from spatial visual assessment by Ramful, Lowrie, and Logan. Next, we interviewed some of students by semi structure interviewed. Finally, we analysed student spatial visual comparing to types of visualization by Hegarty and Kozhevnicov and analysed by gender. We found that generally the students had a lack in spatial visual ability because their pictorial representation, however boys had better spatial visual ability than girls. Keywords: spatial visual, geometry, gender Share Link | Plain Format | Corresponding Author (Della Yurmalia)

179	Mathematics Education	ABS-188
Does math mini laboratory improve pedagogical content knowledge for prospective teachers of madrasah ibtidaiyah? I M Pratiwi, R Kariadinata, L Apriani 1, 3 Pendidikan Guru Madrasah Ibtidaiyah, Universitas Islam Negeri Sunan Gunung Djati, Jl. Soekarno Hatta, Kec. Gedebage, Bandung 40294, Indonesia 2 Pendidikan Matematika, Universitas Islam Negeri Sunan Gunung Djati, Jl. Soekarno Hatta, Kec. Gedebage, Bandung 406294, Indonesia Abstract Pedagogical content knowledge is the ability to convey learning on a specific content that must be possessed by each student teacher prospective. One learning approach that can be applied to develop pedagogical content knowledge is by using mini laboratory approach. The study aims to obtain a pedagogical content knowledge of madrasah ibtidaiyah teachers prospective by using mini laboratory in the Mathematics Education in Madrasah Ibtidaiyah course focusing on geometry studies. This research used pre-experimental methods. The population was all fifth semester students majoring in Madrasah Ibtidaiyah Teacher Education at UIN Sunan Gunung Djati Bandung. The sample obtained from 36 students of class A taken by purposive sampling. Data collected used tests performed t-paired tests with regard to the assumption of normality. The results showed there was differences in the average pedagogical content knowledge of students before and after learning with a mini laboratory. Pedagogical content knowledge of students increased by 0.48 in the medium category. By using mini laboratory, students not only learn the content of the material, but also they do practice teaching. Keywords: geometry, mathematics, mini laboratory, pedagogical content knowledge, prospective teachers of madrasah ibtidaiyah Share Link | Plain Format | Corresponding Author (Inne Marthyane Pratiwi)

180	Mathematics Education	ABS-191
THE APPLICATION OF SPADA TO STUDENTS UNDERSTANDING OF MATHEMATICAL CONCEPTS Marchamah Ulfa (a), Nicky Dwi Puspaningtyas (a) (a) Mathematics Education, Faculty of Arts and Education, Universitas Teknokrat Indonesia, Bandarlampung, Lampung, Indonesia Abstract In this study, learning is carried out by SPADA (Network learning Systems) in calculus/mathematics courses in terms understanding of student concepts. This study aims to see the effectiveness of the application of learning with BL in terms of understanding students concepts. The study used a quasi-experimental technique with a population of all Indonesian Teknokrat University students. The sampling technique uses random sampling and to test its effectiveness a T-test statistic is used with α = 5%. Acquired score understanding of student concept in the experimental class is 78.48 higher than the control class namely 63.93. Based on T-test results, it can be concluded that this learning is effective applied to the mathematics class. The conclusion of this study suggests that the implementation of SPADA is effective when viewed from the understanding of student concepts. This is because SPADA combines face-to-face learning with a network of learning that matches the development of the current era in which every aspect of our lives relies heavily on technology and its development affects us socially, economically, politically, even in our culture and education. In addition, SPADA is an alternative learning to improve level thinking skills. Students are more interested and motivated to learn more earnestly and find learning resources that are getting closer to them through gadgets or computers. Keywords: e-learning- concepts understanding- SPADA- blended learning Share Link | Plain Format | Corresponding Author (Marchamah Ulfa)

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