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121	ABS-360	1. Mathematics Education
Contextual approach in teaching differential calculus Ali Shodikin, Anik Novianti, Wahyu Kyestiati Sumarno Universitas Islam Darul Ulum Abstract This study aims to both designing a modeling task for Differential Calculus course with contextual approach and analyzing the results after task implementation. Interviews were also conducted to six Matemathics pre-service teachers. The researcher initially suspect that the modeling process that occurs would follow the ideal mathematical modeling cycle but this study found that the modeling process did not necessarily follow sequential development according to model construction as described in various mathematical modeling cycles. Keywords: mathematical modeling, differential calculus, contextual approach, local wisdom PermaLink | Plain Format | Corresponding Author (Ali Shodikin)

122	ABS-616	1. Mathematics Education
Level of Secondary-school Students Algebraic Thinking Septiani Yugni Maudy, Didi Suryadi, Endang Mulyana Department of Mathematics Education, Indonesia University of Education Abstract The diversity of students algebraic thinking, has its own levels, which is important for the teachers and the students to notice. This research aimed to describe the level of secondary-school students algebraic thinking. through the assignment of an algebra task to seventh to twelfth graders followed by interview, this research analyzed to what extent their level of algebraic thinking along with underlying experiences. The analysis results indicated that there found levels 0 to 4 from these various grades. Interestingly, the learning of algebra that the student experienced at school did not guarantee their capability to apply algebraic thinking. Keywords: algebra, algebraic thinking level, secondary-school PermaLink | Plain Format | Corresponding Author (Septiani Yugni Maudy)

123	ABS-362	1. Mathematics Education
Students Error in Solving Mathematical Word Problems in Geometry M D Haryanti (1*), T Herman (2), and S Prabawanto (2) 1) Departemen Pendidikan Matematika, Sekolah Pascasarjana, 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 *mutiadwi[at]student.upi.edu Abstract Abstract. Solving mathematical word problems are still considered as a difficult matter for the students, because the word problems are related to many mathematical concepts and language. This study aims to identify students error in solving the word problems deal with plane geometry. The method used in this study was descriptive-qualitative approach. The subjects were 23 grade 7 students from one of Junior High School in Subang, Indonesia. The data analysis focused on the results of the student answers on the written test in plane geometry topic. The analysis of students error based on Polya strategy. The result are that almost student are still in low category deal with problem solving skill especially in mathematical word problems related with plane geometry. Mistakes often made students are the transformation and process skill. The errors due to students have difficulty of understanding the problems, determining the formulas, and illustrating the picture of a given mathematical word problems. It is expected that there will be other research that can be minimize students error related to the plane geometry topic. Keywords: error, mathematical word problem, geometry PermaLink | Plain Format | Corresponding Author (Mutia Dwi Haryanti)

124	ABS-107	1. Mathematics Education
The development of the problem-based learning module to facilitate students mathematical reasoning Nasir Zaba* and Sufyani Prabawanto Departemen Pendidikan Matematika, Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi No. 229, Bandung 40154, Indonesia *nasirzaba[at]upi.edu Abstract The instructional materials which are distributed in schools are not developed to facilitate the students abilities, instead of only consisting of concepts with suitable formulas and the questions without solutions. Based on the problem, the aim of the research is to develop an instructional material in the form of the module which can facilitate the students mathematical reasoning. The research used the development model design of Dick and Carey consisting of nine steps. The module was developed with problem-based learning model in the circle lesson and was evaluated in the validity test. The validity test was examined by four validators dealing with content, construct, language and technique. The module was evaluated in two stages consisting of small and big group tests by students of Senior High School 10 Pekanbaru. After having learned with the developed module, students were tested to solve the problems to know their mathematical reasoning. The results were that the developed problem-based learning module is valid (94.21%) and practical (88.85%), and the students reasoning test is high (88.97%). So, it is concluded that the developed module can facilitate the students mathematical reasoning. Keywords: Learning Module, Problem-Based Learning Model, Mathematical Reasoning PermaLink | Plain Format | Corresponding Author (Nasir Zaba)

125	ABS-364	1. Mathematics Education
Implementation of rigorous mathematical thinking approach to analyze the students ability of algebraic thinking and understanding concept and mathematical habits of mind Vingky Zulfa Asria* and Wahyudin DepartemenPendidikanMatematika, UniversitasPendidikan Indonesia, Jl. Dr.SetiaBudhi No. 229, Bandung 40154, Indonesia Abstract This study aims to determine the improvement of students algebraic thinking skills and understanding of mathematical concept and mathematical habits of mind student using rigorous mathematical thinking. This research is conducted by providing information to student in learning mathematics and analysis to see the improvement of students mathematical ability. The research instrument used is ability test and ability of concept and mathematical habits of mind. The result show that student who learn by using rigorous mathematical thinking have algebraic thinking skills and good conceptual understanding. In addition, students also have good mathematical habits of mind. This evidenced by the result of the questionnaire which indicates that it is in accordance with the answers given by the students and at a fairly high level. Keywords: Algebraic Thinking Ability, Conceptual Comprehension, Mathematical Habits of Mind, Rigorous Mathematical Thinking Approach PermaLink | Plain Format | Corresponding Author (VINGKY ZULFA ASRIA)

126	ABS-109	1. Mathematics Education
Implementation of comic on linear program material to increase mathematical understanding for students of XI grade senior high school S Setiyani Department of Mathematics Education, Universitas Swadaya Gunung Jati Cirebon, Jl. Perjuangan No. 1 Karyamulya, Kesambi, Cirebon, Indonesia *setiyani_0401509081[at]yahoo.com Abstract The purpose of this study is to determine the results of educational comic implementation that has been developed in linear program material. The data were collected on students of XI grade selected by purposive sample. This research uses quantitative descriptive approach. Data collection is done through observation of learning, test and questionnaire of student learning interest after using educational comic. The results showed that educational comic can improve students mathematical understanding ability with N-gain value = 0.48 including high quality improvement. Students interest in following learning using educational comic media of 77% with high interest criteria. So educational comic media has been appropriate in its development because it can improve students mathematical understanding ability and student interest in learning. Keywords: comic education, linear program, mathematical understanding ability PermaLink | Plain Format | Corresponding Author (Setiyani Setiyani)

127	ABS-365	1. Mathematics Education
Students statistical literacy on junior high school Nana Mulya, Elah Nurlaelah, Sufyani Prabawanto Program Studi Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setia Budhi No. 229, Bandung 40154, Indonesia nanamulya[at]student.upi.edu Abstract Statistical literacy is a key ability expected of citizens in information-laden societies, and is often touted as an expected outcome of schooling and as a necessary component of students numeracy and literacy. The facts show that the statistical literacy ability of Indonesian students is still in an alarming category and Indonesian students for junior high school have not been able to compete internationally in the statistical literacy. This qualitative descriptive research was conducted to describe junior high school students ability and difficulties in basic skills of statistical literacy. Data were collected from 6 students of 8th grade in one of junior high schools in Aceh, Indonesia through test and interviews. The results clearly show that students statistical literacy are still in low category. Students are good in understanding the data but they have limited understanding of the data presentation concept. Students have difficulty in using the principle of presenting the data into the pie chart. Many steps of presenting the data are not complete. From this study can be concluded that students basic skills of statisical literacy has not been satisfied. Therefore, mathematics learning process in data presentation concept should be improved. Keywords: Statistical Literacy PermaLink | Plain Format | Corresponding Author (Nana Mulya)

128	ABS-110	1. Mathematics Education
Improve students creative ability in discrete mathematics course with approach open ended assisted visual basic application for excel Martin Bernard (a*), Tina Rosyana (b), M. Afrilianto (b) a) faculty of mathematics education, IKIP Siliwangi Jalan Terusan Jenderal Sudirman, Cimahi 40526, Indonesia *pamartin23rnard[at]gmail.com b) faculty of mathematics education, IKIP Siliwangi Jalan Terusan Jenderal Sudirman, Cimahi 40526, Indonesia Abstract Students are the future generation to develop the technology. Keep in mind, that technology and information is always something to do with mathematics. Difficulties faced today about mathematics is the problem of proof, and it takes the students are led to creative ideas tailored to the definitions and theorems that have been proved. But for the student takes an overview of definitions through mathematical algorithms can be realized and understood by students. One of the subjects relating to proofs is discrete mathematics. The aim here students can understand the integer, number operations, the mathematical logic which is not memorizing but understanding math concepts meaningful based on the development of the student creative process. So that their findings can be a rewarding experience and may be able to develop more extensive utilization of evidence, therefore, researchers Open-Ended approach. To help overview of definitions is needed as delivery tools more effective mathematics which props. Props are used should be Appropriate to the use and purpose of learning, the role of ICTs is needed to convey the image that is associated with VBA for Excel mathematics is an application, the usefulness of affecting data processing. Keywords: Creative Ability of Students, Open Ended Approach, Visual Basic Application for Excel. PermaLink | Plain Format | Corresponding Author (martin bernard)

129	ABS-111	1. Mathematics Education
Exploring of mathematics classroom goal structures in senior high school: an engaging in academic work for student I B Rangka, I Ifdil, K Suranata, A Suwandi, W E Prasetyaningtyas, Z Ardi and R Rahim Universitas Indraprasta PGRI Universitas Negeri Padang Universitas Pendidikan Ganesha Universitas Indraprasta PGRI Universitas Indraprasta PGRI Universitas Negeri Padang Universiti Malaysia Perlis Abstract This study aimed to investigate classroom goal structures based on the teachers learning objectives for students in the mathematics classroom. The study used survey methods with involved 319 students at senior high school level. Data analysis based upon Rasch model as the framework of modern psychometric approach. The internal consistency and psychometric properties for quality of instruments, was appropriate. The results of this study showed that students tend to refuse to labeling as embarrassment behavior if any student who cannot answer or do math problems in the classroom. The students argue although answering math problems properly is a pride or achievement; but, create a judge poor students in mathematics should not occur in the classroom because typically all students are still in the learning stage. Another interesting side of this research findings is that male and female students have differences in looking at the learning climate of mathematics in relation to engaging in academic work. In the context of teacher-student interaction in the classroom, it is vital to consider that a constructive classroom situation and solid learning experienced can avoid to declining students academic motivation and achievement. Keywords: goal structure; mathematics classroom; rasch measurement; student academic work PermaLink | Plain Format | Corresponding Author (Itsar Bolo Rangka)

130	ABS-623	1. Mathematics Education
The Effectiveness of Collaborative Learning Model With Challenging Task on Students Mathematical Problem Solving Skills Ressy Rustanuarsi (a*), Karyati (b) a) Pendidikan Matematika, Program Pascasarjana, Universitas Negeri Yogyakarta Jalan Colombo No. 1, Karangmalang, Yogyakarta 55281, Indonesia *ressyrustanuarsi93[at]yahoo.com b) Jurusan Pendidikan Matematika, FMIPA, Universitas Negeri Yogyakarta Jalan Colombo No. 1, Karangmalang, Yogyakarta 55281, Indonesia Abstract This study aims to examine the effectiveness of collaborative learning model with challenging task in terms of students mathematical problem solving skills. This study was a quasi-experimental with pre-test and post-test control group design. The population of this study was all the eighth grade students in one of the state junior high school in Pontianak that consisted of nine classes, then randomly selected two classes as the samples. One class as the experimental group was taught using collaborative learning model with challenging task, while another class as the control group was taught using collaborative learning model. The data were obtained by tests including a pre-test and a post-test to measure students problem solving skills. Data were analysed using one-sample t-test and independent samples t-test at a significance level of 5% on the normalized gain score. The result of the study shows that collaborative learning model with challenging task and collaborative learning model are both effective in terms of students mathematical problem solving skills. Furthermore, this study concludes that collaborative learning model with challenging task is more effective than the collaborative learning model in terms of students mathematical problem solving skills. Keywords: Collaborative learning; Challenging task; Mathematical problem solving skills PermaLink | Plain Format | Corresponding Author (Ressy Rustanuarsi)

131	ABS-112	1. Mathematics Education
The analysis of students reflective thinking ability viewed by students mathematical ability at senior high school A Salido* and D Dasari Departemen Pendidikan Matematika, Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia *achmadsalido28[at]upi.edu Abstract The reflective thinking ability is the students ability to actively think through the rules they know with caution to solve the problem. The reflective thinking ability is also one of the higher order thinking skills (HOTS) demanded of learners. Through applying the newest national curriculum, the Indonesian government wants students to master the 20th century skills. The types of skills are communication, collaboration, critical thinking and problem solving, and creativity and innovation. This study used the qualitative method with the descriptive design. Data collection used instruments of test and interview. Subjects in this study were three students of class XI at Senior High School. The research subjects, based on the mathematical ability, were divided into three categories, that are high, medium and low. While the reflective thinking ability is divided into four stages: habitual action, understanding, reflection and critical reflection. The results showed that the student with the high level is at the stage of reflection, the student with the medium level is at the stage of understanding, and the student with the low level is at the stage of habitual action. It can be concluded that students reflective thinking ability is not yet developed optimally. Keywords: Reflective thinking, mathematical ability PermaLink | Plain Format | Corresponding Author (Achmad Salido)

132	ABS-369	1. Mathematics Education
Algebraic Thinking Students By Using Patterns Reni Wahyuni; Sufyani Prabawanto 1Departemen Pendidikan Matematika, Sekolah Pascasarjana , Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia 1Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia Abstract This article focus on generalizing numbers by using patterns has development of algebraic thinking. Patterns as one of the any components are tools to maintain the students to think from arithmetic to algebraic. The examination of numerical patterns can be presented with the help of visualization, by using images or geometry, aimed to assisting students in developments their sensitivity of generalizations. Student is given patterns of any objects that including visualization of colour images. The student predicted the next tribes of a recurring pattern. Students gave a strategy to predict any tribes from repetitive patterns. Then student tried to evaluate what the relationship between the numbers. The steps of these studies will be extensive to development algebraic thinking in formal symbolization. By using patterns as generalization could help students in learning although it was not directly learning algebra. Keywords: Algebraic thinking; patterns, generalization PermaLink | Plain Format | Corresponding Author (Reni Wahyuni)

133	ABS-625	1. Mathematics Education
The Implementation of Problem-based Learning Viewed from Mathematical Connection Ability Erlinda Rahma Dewi , Marsigit Universitas Negeri Yogyakarta Abstract The mathematical connection ability is very important for students. The mathematical connection ability includes (1) connection between mathematical topics, (2) connection with other disciplines, (3) relationships in everyday life. The aimed of this research was to describe the effect of problem-based learning on mathematical connection ability of the 8th class students (age 13-14). This research was quasi-experiment with one group pretest-posttest design. The research samples consisted of one class taken randomly from 4 classes in the population. The data collected by using mathematical connection ability achievement test that has been declared valid by the expert team. The data analysis used one sample t-test. The criterions of effective are: 1) posttest score is higher than pretest score and 2) the proportion of student that pass the mathematical connection criterion is more than 75%. Based on the result of one sample t-test, the significance value is 0,000, it can be said that the problem-based learning approach is effective in terms of students mathematical connection ability. The effectiveness of mathematics learning with problem-based learning approach reach 87,55%. It can be concluded that the problem-based learning is effective on mathematical connection ability. Keywords: problem-based learning , mathematical connection PermaLink | Plain Format | Corresponding Author (Erlinda Rahma Dewi)

134	ABS-626	1. Mathematics Education
Didactical design research of quadratic function based on learning obstacle and learning trajectory Redo Martila Ruli, Sufyani Prabawanto, Endang Mulyana Universitas Pendidikan Indonesia Abstract Students understanding on the topic of quadratic equation and quadratic function is separated each other, whereas both are interconnected. This research aimed to formulate a didactic design, which will help junior high students understand the linkage between both topics. By employing a didactical design research (DDR), this research involved the process of repersonalization and recontextualization of quadratic function to explore the learning trajectories and learning obstacles within such a process. This design aimed to represent the context of the assigned problem, and was analyzed through the following steps: 1) the explorative prediction of students responses related to the assigned problem; 2) collaborative learning to lead the students in understanding the linkage of both concepts: quadratic equation and quadratic function. Assigned by a contextual problem related to quadratic function, the students could widen their understanding about quadratic equation, but simultaneously encountered difficulties in relating the topic with quadratic function. In this case, collaborative learning helped them in doing so. Keywords: Didactical design research (DDR), Learning Obstacle, Learning Trajectory, Quadratic Function PermaLink | Plain Format | Corresponding Author (Redo Martila Ruli)

135	ABS-116	1. Mathematics Education
The improvement of students mathematical understanding ability influenced from argument-driven inquiry learning Wahyu Hidayat (a*), Usman Aripin (a) a) IKIP Siliwangi Jalan Terusan Jenderal Sudirman, Cimahi, West Java 40526, Indonesia *wahyu[at]ikipsiliwangi.ac.id Abstract The aim of this study was to examine the role of Argument-Driven Inquiry (ADI) learning toward the improvement of the mathematical understanding ability of mathematics teacher candidate students. The population of this study is students of mathematics teacher candidate in Cimahi City, while the sample is 270 students of mathematics teacher candidate determined purposively and then randomly to be included in experiment and control class. The results show that (1) the mathematical understanding ability improvement of students who received Argument-Driven Inquiry (ADI) learning is better than those who studied using direct learning viewed on the whole; (2) There is a difference in the improvement of mathematical understanding ability of students with Argument-Driven Inquiry (ADI) learning which is better than those who learn by direct learning in terms of PAM (High, Moderate and Low) factors; (3) There is no interaction effect of Learning Factor and PAM on improving students mathematical understanding ability. Keywords: Argument-Drivent Inquiry; Mathematical Understanding PermaLink | Plain Format | Corresponding Author (Wahyu Hidayat)

136	ABS-373	1. Mathematics Education
Pre-service teachers beliefs and knowledge about mathematics Muhtarom (a*), Dwi Juniati (a), Tatag Yuli Eko Siswono (a), Nurina Happy (b) a) Post-graduate Program of Mathematics Education, Universitas Negeri Surabaya, Indonesia *muhtarom[at]upgris.ac.id b) Department of Mathematics Education, Universitas PGRI Semarang, Indonesia Abstract This study describes the knowledge and beliefs of pre-service teachers to mathematics. Data collection of this study using written test of 143 mathematics pre-service teachers who have taken six semesters at Universitas PGRI Semarang, and interviewing of 3 students who are not consistent between knowledge and belief. The data are presented in the form of descriptive quantitative and analyzed qualitatively, including: data reduction, data display, and conclusions drawing/verification. The results show that most of the knowledge of pre-service teachers are consistent with their beliefs. It is indicate that the pre-service teachers knowledge has been internalized into a strong beliefs that affects their words and behaviors. The belief of almost half of pre-service teachers who become respondents changes because of lecturer activity effect. It can say that belief changes at any time, both the process of alteration and formation of new beliefs as well as the reinforcement of the beliefs they have. Keywords: knowledge, beliefs, mathematics and pre-service teachers PermaLink | Plain Format | Corresponding Author (Muhtarom Muhtarom)

137	ABS-118	1. Mathematics Education
A multi-group structural equation model (SEM) examining attitude toward statistics effects on academic achievement by gender Muji Gunarto (a*), Dian Cahyawati (b) a) Universitas Bina Darma. Jl Jend A Yani No 3 Palembang, INDONESIA. *) mgunarto[at]binadarma.ac.id b) Universitas Sriwijaya. Jl Raya Palembang-Prabumulih Km 32 Indralaya, INDONESIA. Abstract Educators in the university level have a great challenge in delivering introductory statistics course because most of students view that statistics is a difficult subject. That difficulty views of statistics affect on lazyness to learn and to joint in the statistics class. The purpose of this study was to identify students attitudes toward statistics based on gender and to examine the relationship between attitudes toward statistics (ATS) and academic achievement (AA). The sample was selected purposively as much as 118 students who joint in the introductory statistics course from two different field of studies in one of the universities in South Sumatra. The ATS was measured by six dimension, namely affective, cognitive competence, value, difficulty, interest, and effort. The AA was measured by the Grade Point Average and the final score of introductory statistics course. The data analysis used a multigroup structural equation model. The results showed that the ATS measurement model can be explained by the dimensions of value, interest, effort, and affective whereas the difficulty and the cognitive dimensions were not consistent in explaining its model both for men and women. The relationship between ATS and AA was no significant neither for men and women. Keywords: academic achievement, attitude toward statistics, structural equation modeling. PermaLink | Plain Format | Corresponding Author (Muji Gunarto)

138	ABS-630	1. Mathematics Education
A test construction based on mathematical problem solving ability for quadrilateral Arina Nur Indriani*, Jarnawi Afgani Dahlan, Sufyani Prabawanto Departemen Pendidikan Matematika Sekolah Pascasarjana, Universitas Pendidikan Indonesia Jl. Dr. Setiabudhi No.229, Bandung 40154, Indonesia *arinanurmath[at]student.upi.edu Abstract The ability to solve mathematical problems becomes an important skill the students should possess. Thus, it becomes an important duty for the teachers to help the students solve any encountered problem in their daily life. In the classroom learning, they need to teach the students how to solve the problem. It is not enough by assigning the routinized problems. This research aimed to construct a mathematical problem-solving test to assess students mathematical problem-solving ability. The research method included several steps, namely: analysis, developing test, evaluating test, trial, revising the test, and collecting data on test validity and reliability. The research data were collected by using a written test, which was administered to 31 seventh-grade students at one of state Junior High Schools. The test consists of four essay questions with four indicators. The results showed that: (1) the mathematical problem-solving test was considered valid and applicable; (2) the test showed a good distinguishing power; and (3) the difficulty levels of the instrument were moderate and difficult. In conclusion, the constructed mathematical problem-solving instrument is applicable to assess the students mathematical problem-solving ability. Keywords: test construction, mathematical problem solving ability PermaLink | Plain Format | Corresponding Author (Arina Nur Indriani)

139	ABS-120	1. Mathematics Education
Measuring of Student Learning Performance Based on Geometry Test for Middle Class in Elementary School Using Dichotomous Rasch Analysis S Solihatun, I B Rangka, D Ratnasari, A Radyati, Y Siregar, L Wulansari, I Ifdil, A Sofyan and R Rahim Universitas Indraprasta PGRI Universitas Indraprasta PGRI Universitas Indraprasta PGRI Universitas Indraprasta PGRI Universitas Indraprasta PGRI Universitas Indraprasta PGRI Universitas Negeri Padang Universitas Negeri Semarang Universiti Malaysia Perlis Abstract Understanding of geometry concept properly and precisely can stimulate students to representing and expressing the world around in orderly order. This study was designed to measure students ability in answered geometry exam. The study involved 186 students in elementary school. Data collected based on the results of midterm examination; conducted in March 2018 and analyzed using dichotomous Rasch model approach. The results of this study show that overall the students ability in identifying the number of sides in geometry image is fascinating. Unfortunately, students get it difficult to work on narrative test in geometry. It is clearly recognized that students experience difficulties in explaining and determining the circumference and square area, rectangular and triangular and second-rank relations with square roots. Furthermore, there are excellent students taking on geometry questions on certain competency requirements; and there are students failed to finish geometry exam properly. The quality of tests applied to students in mathematics exams is also a substantial issue into the discussion on this article. The findings of this research can be a substantial input for classroom teachers in developing suitable geometry learning methods and dealing with the issues linked to students ability to learn geometry in elementary schools. Keywords: geometry test; students ability; dichotomous rasch model; elementary school PermaLink | Plain Format | Corresponding Author (Solihatun Solihatun)

140	ABS-121	1. Mathematics Education
Assessing Use of PowerPoint by Teacher Candidates in Teaching Mathematics Mimih Aminah (a*), Eva Tri Wahyuni (a) a)Program Studi Pendidikan Matematika, STKIP Sebelas April Sumedang, Jl. Angkrek Situ No. 19, Sumedang 45323, Indonesia * mimih.aminah[at]yahoo.co.id Abstract The use of PowerPoint technology in the classroom has become very popular today because it is considered to enhance teaching quality. However, its use is not free from criticism with the emergence of phrases such as PowerPoint is Evil and Death by PowerPoint. Mathematics and teaching-learning mathematics have certain characteristics, therefore, the creation and execution of presentation in the class with PowerPoint format requires certain handling as well. This study intends to explore students perceptions and teachers judgments on the use of PowerPoint in mathematics learning by teacher candidates. Participants in this study were 14 teacher candidates, 5 math teachers, and 421 students in two vocational high schools. The student questionnaire result shows that with PowerPoint presentations, in general, students: (1) are motivated and helped to learn math, (2) value the management of slide shows quite well, but (3) tend to only listen to the teacher during the learning process, and (5) feel that sometimes lessons are easier with PowerPoint, sometimes not. Teachers observation result shows that most of the presentations of the teacher candidate are good enough in terms of material suitability and arrangement aspects, the use of mathematical language and symbols, animation, and student involvement. Keywords: Microsoft PowerPoint, teacher candidate, teaching mathematics, students perceptions, teachers judgments PermaLink | Plain Format | Corresponding Author (Mimih Aminah)

141	ABS-377	1. Mathematics Education
The Ability of Superior Student in Fraction Materials Based on Ecopreneurship S Aryanto1.a), E Syaodih2, B Maftuh3 and A Jagad4 1Program Pendidikan Dasar Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia 2Departemen Ilmu Pendidikan, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia 3Departemen Ilmu Pendidikan Sosial, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia 4Program Kewarganegaraan Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia Abstract One of the innovations in mathematics learning is the implementation of ecopreneurship principle as a representation of social science approaches in developing fractional problems at the inclusive of primary school aimed at superior students. So this study aims to provide an overview of superior students understanding skills in fractional materials through the development of questions based ecopreneurship that are expected to improve superior students cognitive ability and be able to interpret questions that implicitly imply the principle of ecopreneurship. This Action Research conducted on 3 superior students in the inclusive of primary school proves that there is an enhancement in students understanding in fractional material in cycle II by 45% when it compared with cycles I. the indicators is that students are able to apply the concepts and answer the questions precisely in addition to implicitly they are able to understand the content of questions related to the principle of ecopreneurship. The results are expected to become the reference for the teachers in developing more innovative mathematics lessons. This concept is expected to be a new finding that is useful in improving superior students understanding in answering mathematical fractions and is expected to be able to train their social skills. Keywords: Ecopreneurship, Fraction and Superior Student PermaLink | Plain Format | Corresponding Author (Sani Aryanto)

142	ABS-634	1. Mathematics Education
Students mathematical ability and spatial reasoning in solving geometric problem S Marifatin, S M Amin, and T Y E Siswono Pascasarjana Program Pendidikan Matematika, Universitas Negeri Surabaya, Jl. Ketintang No.30, Surabaya 60231, Indonesia Departemen Pendidikan Matematika, Universitas Negeri Surabaya, Jl. Ketintang No.30, Surabaya 60231, Indonesia Abstract Students have many difficulties in geometry such as disability to visualize two dimensional to three dimensional objects. That is indicated by lower spatial reasoning. This study aims at describing the spatial reasoning of students in solving geometric problem. This qualitative research involved three elementary students that are consist of highest, middle, and lowest students ability. The results pointed out the highest and middle recognized geometry object and they could explain some information which is known and asked correctly. The highest student also could imagine cube nets into cube and describing the surface of the cube when it viewed from the right, left, top, bottom, front, and back. The middle student could not drawing surface of the cube appropriately when viewed from the right, left, top, and bottom. The lowest student could not recognized geometry object, nor could mention the information. Finally, we suggest teachers to teach middle and low students to deepen the introduction of geometric objects. Keywords: Spatial reasoning, Mathematical Ability, Geometric Problem PermaLink | Plain Format | Corresponding Author (Siti Marifatin)

143	ABS-125	1. Mathematics Education
Ethnomathematics Study: Revealing Mathematical Aspects in Determination of a Good Daily Activities in Indigenous Societies of Paseban and Cikondang West Java I Muhafidin, E Nurlaelah, E Sudihartinih Departemen Pendidikan Matematika FPMIPA UPI Abstract This study is an attempt to show the relationship between culture and mathematics. Students paradigm nowadays considers that Mathematics is an abstract concept; as a result they do not like the subject. In fact, indirectly within a culture or group. The aim of the study is to determine the existence of mathematical aspects in determining a good day of daily activities in indigenous societies of Paseban and Cikondang villages. This study uses a qualitative approach with ethnography method such as observation, interviews, documentation, and field notes. The research is conducted in two places namely Paseban Tri Panca Tunggal Cigugur Village, District Cigugur, Kuningan regency, West Java and Cikondang, Lamajang Village, District Pangalengan, Bandung regency, West Java. The results of the study show that there is the presence of mathematical aspects in determining good day of daily activities in indigenous societies of Paseban and Cikondang villages. This study recommends that mathematics is closely related to culture due to the existence of ethnomathematics. Keywords: ethnomathematics, qualitative, ethnogrhapy, Determination Good Day Activities Every day, Paseban Indigenous Sociey, Kampung Cikondang Indigenous society. PermaLink | Plain Format | Corresponding Author (Irfan Muhafidin)

144	ABS-381	1. Mathematics Education
From Integer to Real Numbers: Student Obstacles in Understanding Decimal Numbers Riska Oktaviani Tristania Pulungan (a*), Didi Suryadi (b) (a) Pendidikan Dasar, Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia *riskaoktavianitristania[at]student.upi.edu (b) Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia Abstract Abstract. The various difficulties and obstacles that students face when they are introduced to decimal numbers are well documented and described in the relevant bibliography. This research is a preliminary qualitative research. The participants of the study are 60 six and five graders. The data were collected using the test. The data analysis showed that the elementary school students performance on number sense of decimal was still weak on the component of understanding the meaning and concept of numbers. Keywords: Obstacles; Decimal Numbers PermaLink | Plain Format | Corresponding Author (Riska Oktaviani Tristania Pulungan)

145	ABS-637	1. Mathematics Education
Mathematical Problem Solving Under Process Oriented Guided Inquiry Learning Model S Artilita1, S Prabawanto2, and D Dasari2 1Departemen Pendidikan Matematika, Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setia Budhi No. 229, Bandung 40154, Indonesia 2Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setia Budhi No. 229, Bandung 40154, Indonesia Abstract This study aims to perceive the improvement of mathematical problem solving of students who get learning with Process Oriented Guided Inquiry Learning (POGIL) model and students who get conventional learning. Implementation of POGIL model can improve mathematical problem solving. This study used quasi experimental approach, utilizing the control group pretest post test design of two groups students 8th grade in one of the junior high schools in Bandung. The result of this study showed mathematical problem solving in the experiment group is better than the control group. This is because the experimental group acquire POGIL model that trained students mathematical problem solving well. All in all, it can be concluded that the POGIL model can be an appropriate choice in improving students mathematical problem solving. Keywords: Problem Solving, POGIL, 8th grade student PermaLink | Plain Format | Corresponding Author (Sindy Artilita)

146	ABS-126	1. Mathematics Education
Design of interactive teaching materials based on a scientific approach to support junior high school students learning: line and angles H Pujiastuti, Fitriah Universitas Sultan Ageng Tirtayasa Abstract This research is motivated by the need of teaching materials that can support the implementation of Curriculum 2013. It is known that one of the emphasis in the Curriculum 2013 is the use of a scientific approach in the learning process. The purpose of this research is to develop the interactive teaching materials based on scientific approach (ITMSA) that can support the learning process for junior high school students, especially on the topics of line and angles. The method used is research and development (R&D) consisting of 10 stages, namely: 1) Research and information collecting, 2) Planning, 3) Develop preliminary form of product, 4) Preliminary field test, 5) Main product revision, 6) Main field test, 7) Operational product revision, 8) Operational field testing, 9) Final product revision, and 10) Dissemination and implementation. The results concluded that: 1) the ITMSA obtained a total score 87.50% from mathematics expert, 88.67% from mathematics education expert, 86% from multimedia expert, and 89.36% responses from students, and 2) students mathematical concept understanding who learn by using ITMSA better than student who learn without ITMSA. From these results concluded that the ITMSA is considered feasible and can be used in learning mathematics in the schools. Keywords: Interactive teaching materials, Scientific approach, Lines, Angles PermaLink | Plain Format | Corresponding Author (Heni Pujiastuti)

147	ABS-127	1. Mathematics Education
Chromotherapy: an alternative treatment for mathematics anxiety among elementary students I Ifdil 1, R P Fadli 1, N Zola 2, L Erwinda 2, A Sari 2, E Churnia 2, I B Rangka 3, S Solihatun 3, K Suranata 4, K Bariyyah 5, Z Ardi 1, A Afdal 1, R Refnadi 1, Z Zufriani 6, N Nikmarijal 7, D Dahlan 8, L Fitria 9, M Barseli 9 1 Universitas Negeri Padang, West Sumatera, Indonesia 2 Indonesian Institute for Counseling, Education and Therapy, West Sumatera, Indonesia 3 Universitas Indraprasta PGRI, Jakarta, Indonesia 4 Universitas Pendidikan Ganesha, Bali, Indonesia 5 Universitas Kanjuruhan Malang, East Java, Indonesia 6 Institut Agama Islam Negeri Kerinci, Jambi, Indonesia 7 Institut Agama Islam Negeri Syaikh Abdurrahman Sidik Bangka Belitung, South Sumatera, Indonesia 8 UIN Sultan Thaha Saifuddin Jambi, Jambi , Indonesia 9 Universitas Putra Indonesia YPTK Padang, West Sumatera, Indonesia Abstract Mathematics is often a frightening subject for students. Such conditions are caused by a stressful learning atmosphere, mathematics subjects that create anxiety. Anxiety experienced by students in learning mathematics has the potential to cause depression conditions on the mathematics. Based on this, a chromotherapy treatment was used to reduce the anxiety of elementary school students to mathematics. Chromotherapy is a treatment designed with the foundation that any color contains healing energy. The effect of color affects the work of sympathetic and parasympathetic nerves and improves mood. Chromotherapy provides an element of relaxation, which from various studies found to reduce anxiety in individuals. This research uses single-subject design to five students of elementary school with high anxiety. Instruments used Mini Mathematic Anxiety Scale (MMAS) and observation. The results show that chromotherapy provides relaxation and reduces anxiety among students. Based on such things this therapy can be one alternative treatment in helping elementary school students cope with anxiety to the subjects of mathematics. Keywords: chromotherapy, mathematics, anxiety, elementary students PermaLink | Plain Format | Corresponding Author (Ifdil Ifdil)

148	ABS-384	1. Mathematics Education
Algebraic Thinking Characteristics of Eighth Grade Junior High School Students Based on Superitem Test of SOLO Model Dwi Inayah Rahmawati (1*), Nanang Priatna (2), Dadang Juandi (2) 1)Departemen Pendidikan Matematika, Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia *dwiinayah28[at]student.upi.edu 2)Departemen Pendidikan Matematika, Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia Abstract Abstract. The study aimed to know the characteristic of algebraic thinking of eighth grade junior high school students based on identification result using Superitem test of SOLO model. This study used descriptive qualitative method. The subject of this study is eighth grade junior high school students consisting of 32 students. The data collection method used in this study is superitem test of SOLO model and interview. The results showed there were differences of algebraic thinking characteristics of students based on levels of Superitem test of SOLO model. Subjects at the unistructural level have algebraic thinking characteristics as mathematics language, mathematics modeling, and arithmetic generalization. Subjects at the multistructural level have algebraic thinking characteristics as representation, mathematics language, mathematics modeling, and arithmetic generalization. Subjects at the relational level have algebraic thinking characteristics as mathematics language, mathematics modeling, arithmetic generalization, and problem solving. Subjects at the extended abstract level have algebraic thinking characteristics as representation, mathematics language, mathematics modeling, arithmetic generalization, problem solving, and quantitative reasoning. Keywords: Algebraic thinking characteristics, Superitem Test of SOLO Model PermaLink | Plain Format | Corresponding Author (Dwi Inayah Rahmawati)

149	ABS-386	1. Mathematics Education
Students thinking processes on Blooms taxonomy: exploring direct instruction learning model Arif Widayanto, Hasih Pratiwi, Mardiyana Post Graduate of Mathematics Education, Universitas Sebelas Maret, Jl. Ir. Sutami No.36 A, Kentingan, 57126, Jebres, Surakarta, Indonesia Abstract This research aimed to describe the levels of thinking students in mathematical problem-solving based on Blooms taxonomy as seen from Direct Instruction learning model. The cognitive domain contains intellectual-centered behavior, such as knowledge, and thinking skills. Direct Instruction is an instructional model that focuses on the interaction between teachers and students The type of this research is descriptive research with a qualitative approach. The research subjects were taken by one student in Direct Instruction learning model which then given the mathematical problem-solving test and the result was triangulated by interview. From this research, it is found that Direct Instruction student can achieve analyzing thinking level. Keywords: Direct Instruction, problem-solving, Blooms taxonomy, cognitive domain PermaLink | Plain Format | Corresponding Author (arif widayanto)

150	ABS-387	1. Mathematics Education
Mathematical Communication Ability of Students Viewed from Self-Efficacy Aprisal (a*), Agus Maman Abadi (b) a) Graduate Program of Mathematics Education, Yogyakarta State University, Jl. Colombo No.1, Karangmalang, Depok Sleman, Yogyakarta 55281, Indonesia. *aprisal.2016[at]student.uny.ac.id b) Mathematics Department, Faculty of Mathematics and Natural Science, Yogyakarta State University, Jl. Colombo No.1, Karangmalang, Depok Sleman, Yogyakarta 55281, Indonesia. Abstract This research aimed to describe mathematical communication ability of students viewed from self-efficacy. This research was descriptive qualitative research. Subjects in this research were students of eight grade SMP Negeri 1 Marioriawa Kabupaten Soppeng Sulawesi Selatan. The data were collected by a test, questionnaire, and interview. Data analysis techniques consisted of three steps, namely: data reduction, data display, and make conclusion. The result of data analysis showed that students with high self-efficacy could master all indicators of mathematical communication ability, namely: ability to identify and write information needed in solving problems by using notation, symbol, or mathematical term; ability to translate the essay or word problems into the picture or sketch and create mathematical models; ability to use precise mathematical concepts in solving the problem. Students with moderate self-efficacy could master two indicators, namely: ability to identify and write information needed in solving problems by using notation, symbol, or mathematical term; ability to translate the essay or word problems into the picture or sketch and create mathematical models. Students with low self-efficacy were only able to master indicator of ability to identify and write the information needed in solving problems by using notation, symbol, or mathematical term Keywords: Mathematical communication ability, self-efficacy PermaLink | Plain Format | Corresponding Author (Aprisal Aprisal)

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