Indonesia Conference Directory

Corresponding Author
Alberta Parinters Makur

Institutions
STKIP Santu Paulus

Abstract
This study discussed the exploration of mathematical concepts in Traditional Mat, Loce, as a product of Manggarai culture. This study aimed to describe the mathematical ideas contained in the Traditional Mat, Loce, Manggarai and how the linkages between the concepts found in the traditional mats, Loce, Manggarai and the topic of learning in schools. This research was qualitative research with ethnographic methods. Data collections were carried out through observation, interviews, and documentation. The subjects in this study consisted of 4 people, namely community leaders who could carry out Rojok Loce activities and the craftsmen. The results of this study indicated that there were several mathematical concepts found in the traditional mat, Loce, and had links in the topic of Mathematics learning in the School, namely the idea of fraction distribution, measurement, burial and measurement of the area of the flat building. The concept of fraction is when a craftsman mats a strand of pandanus leaves into several parts with an unequal size, the idea of measurement is still using traditional measurements of pagat and depa which are used to measure the length and width of the mat, the concept of mating during the mat making process the same form unit square to produce a mat and the concept of measuring the area of flat building when the mat is finished.

Keywords
Ethnomathematics, Loce, Manggarai culture, Traditional Mat

Topic
Mathematics Education

Link: https://ifory.id/abstract/gucYWmfywtAn

Corresponding Author
Wati Susilawati

Institutions
Faculty of Tarbiyah and Teacher Training UIN Sunan Gunung Djati Bandung

Abstract
This study aims to improve students mathematical reasoning abilities through learning by Kahoot application-assisted Challenge Based Learning model with the Examination for Japanese University question format. Quasi-experimental research was held at High School 26 Bandung. Involving 60 students from three classes, each class consisted of 20 students. The instruments used test of mathematical reasoning ability. The results of the study are there is an increase in mathematical reasoning ability of students who got Kahoot application-assisted Challenge Based Learning model with the Examination for Japanese University question format, Challenge Based Learning with Examination for Japanese University, and conventional learning; and increase of mathematical reasoning ability of students got obtained Kahoot application-assisted Challenge Based Learning model with the Examination for Japanese University question format was better than Challenge Based Learning with the Examination for Japanese University and conventional learning. So, the implementation is student can construct their knowledge based on challenge and problems into a real solution.

Keywords
Challenge, Examination for Japanese Univeristy, Mathematical Reasoning

Topic
Mathematics Education

Link: https://ifory.id/abstract/wk7nvH8AMJ3h

Corresponding Author
Bambang Riyanto

Institutions
1Universitas Sriwijaya, Jalan Srijaya Negera, Bukit Besar, Palembang, Indonesia

Abstract
Mathematics is more meaningful for students with modeling and students are interested in this approach. The purpose of this study is firstly, how to design the task of modeling high school mathematics by using the context of “Jembatan Musi 2” for valid, practical and effective mathematics learning ?, secondly, how is the modeling of high school mathematics using the context of “Jembatan Musi 2” taught in high schools in Indonesia ?, Lastly, how do students learn to model high school mathematics using the context of the “Jembatan Musi 2”?. This study uses a research development research method or a design research type development study. Based on one-to-one, small groups, pilot teaching, teaching experiments, and retrospective analysis learning devices are obtained for teachers teaching mathematical modeling, student worksheets, for teachers teaching mathematical modeling and mathematical modeling assignments using the context of “Jembatan Musi 2” for students learning modeling mathematics.

Keywords
Mathematical Modeling Approach, Senior High School, Jembatan Musi 2 Context

Topic
Mathematics Education

Link: https://ifory.id/abstract/AFp4UM6yCHW3

Corresponding Author
Rahmat Safari

Institutions
Faculty of Social and Political Sciences, Universitas Jenderal Soedirman

Abstract
Implementation is a part of the policy process stages which is seen as separate from policy formulation process (Hupe and Hill, 2015). Policy implementation reflects a complex change process which government decisions are transformed into programs, procedures, regulations, or practices for social improvements (DeGroff and Cargo, 2009). Both explicitly and implicitly, policy implementation aims to achieve various types of changes among target groups (Nilsen, 2013). Therefore, the assessment of policy implementation is essential, it will promote accountability, enhancing effectiveness, and fostering equity and quality (Bhuyan, 2010). Recently, the quality of Indonesian education has been faced with the phenomenon of favorite schools and non-favorite school. This dichotomie seems as a problem (Martono, 2017). To overcome this, the government then issued school zoning policy in new student acceptance. The purpose of this policy is to make education have same quality level. However, few problems then appear. This effort is not followed by balanced school distributions in some areas. For example in the ex administrative city of Purwokerto at the middle school level. From 28 schools, 9 schools are state-owned and 19 schools are private-owned. Moreover, the practice of this policy also gets pros and cons in several regions in Indonesia.

Keywords
Public Policy, Policy Implementation, Education, School Zoning Policy

Topic
Public Policy, Public Service and Sustainable Development

Link: https://ifory.id/abstract/Ab9hVEm76yfj

Corresponding Author
Indra Siregar

Institutions
(a) STKIP Sebelas April
*dracakep[at]yahoo.co.id
(b) Universitas Pendidikan Indonesia

Abstract
The Study is a part of research on article at Journal of Physics: Conference Series which were published in 2017. At the article, has be showed the implementation of Greens motivational strategies at teaching material in mathematics teaching, but the explanation is to simple. On this article, will be explained more considerable about the implementation of Greens motivational strategies at teaching material. Beside that, will be explained another findings which not published on the last article. One of the findings is the teaching material which be made based on Greens motivational strategies can make student get more motivation and confidence in mathematics problem exercise without motivational speech from teacher or other motivational activity like hypnosis. The content of the teaching activity on the class is full of mathematics problem exercise. Greens motivational strategies can become new style on mathematics teaching and of course become new hope to make Indonesian mathematics education be better on the future.

Keywords
Greens Motivational Strategies, motivation

Topic
Mathematics Education

Link: https://ifory.id/abstract/fgMYRcUpH3GA

Corresponding Author
Siti Zunariyah

Institutions
Department of Sociology, Sebelas Maret University

Abstract
Tourism sector has grown into superior sector with rapidest growth in the world and been a locomotive of economic growth. Kelurahan Setabelan of Surakarta City is attempting to develop culture- and locality-based tourist village. Using action research method and theory of community empowerment by John Friedman, this research aimed to describe the process of empowering the villagers conducted in participative manner and involving stakeholders. The result of discussion showed that community empowerment process was conducted through the production of knowledge on history of village, potency, need, and problem. The result of knowledge production was used as the data to design workshop for citizens through Focus Group Discussion (FGD) mechanism. Workshop series has been implemented because the community interested in packaging the cultural of village potency as tourist attraction. The culture of citizens potency is packaged in the form of village profile book, village diary, documentary video, village sketch, Open Street Map (OSM) and infographic published through website and social media that are accessible widely. Thus, empowering the village through the potency it has in cultural context will give shape to knowledge, belief, understanding, and custom and habit or ethic guiding human behaviour in living within his community.

Keywords
empowerment, tourist village, culture and locality.

Topic
Sociological Aspects of Strengthening SDGs Achievement

Link: https://ifory.id/abstract/TZgUyezYFjQk

Corresponding Author
Veny Triyana Andika Sari

Institutions
a), b) Pendidikan Matematika, IKIP Siliwangi. Jalan Terusan Jenderal Sudirman, Cimahi 40526, Indonesia
*venytriyana050113[at]gmail.com

Abstract
The aim of the study was to determine the effect of Knisleys mathematical model on students mathematical critical thinking skills based on gender. The research sample consisted of two classes in class 2018 in one of the PTS Cimahi. The research instrument was a test of mathematical critical thinking skills. The analysis technique uses ANAVA with IBM SPSS Statistics 24 application. Overall the results of this study are that there is no interaction seen between the learning model carried out with gender differences because there is still a mismatch between the interactions obtained by the significance value and the general average, especially those which indicate the average mathematical thinking ability of male students men who use the Knisley mathematical model are lower than male students who use the normal learning model and the average mathematical thinking ability of male students who use Knisleys mathematical model is lower than female students.

Keywords
Knisleys Mathematical Model; Mathematical Critical Thinking; Gender

Topic
Mathematics Education

Link: https://ifory.id/abstract/KZ6UwFTCqQXP

Corresponding Author
Sukarso Sukarso

Institutions
Universitas Jenderal SOedirman

Abstract
Abstract The study of moral issues in public administration has been dominated by instrumental values about achieving goals, not by the goals themselves. History about the values adopted by public administration as far as starting from the classics with effectiveness and efficiency to those considered contemporary with democracy and participation are mostly hurly-burly. Public administration, therefore, tends to be out of its context. Phenomenology and even anthropology studies are not strong enough to coloring the development of public administration ethics. In the Indonesian context, moral values in public administration research and practice appear to be undeveloped properly yet. The doctrine of dichotomy in public administration is so ingrained. The public administration has no determined their moral values themselves. With a meta-analysis approach, the results of the study show that public administration in Indonesia has not cared about efforts to look for its moral values, except values that are currently popular in global discourse. It has an impact on the vulnerability of sustainable development effort. It is unrooted policies anyway except a phenomenological approach to the ethics field.

Keywords
ethics, sustainable development, public policy.

Topic
Public Policy, Public Service and Sustainable Development

Link: https://ifory.id/abstract/FrB3wLk8f7YA

Corresponding Author
Siti Hindun

Institutions
Departemen Pendidikan Matematika, IKIP Siliwangi, Jl. Terusan Jenderal Sudirman, Cimahi, Indonesia
*e2rht[at]ikipsiliwangi.ac.id

Abstract
Self efficacy (SE) and mathematical critical thinking skills (MCTS) have been studied extensively. But study about the correlation of booth based on students cognitive stages (SCS) is rarely done. This study involved 25 students from seventh grade determined by purposive sampling technique in one of the schools in Cimahi. The instrument used the Longeot test, Test of Logical Thinking (TOLT), an Essay MCTS, and a scale of SE. Data analysis performed: percentage calculation, testing of mean difference, and correlations testing at a significance level of 5%. Based on the results and discussion it was concluded that, in general, the SCS classification of seventh grade students based on the Longeot Test and TOLT scores was obtained 24% of students were in the concrete stage, 68% of students were in the transition stage, and 8% of students were in the formal stage. This means that most seventh grade students are in the transition stage. There are differences in MCTS based on SCS. There is no difference in SE based on SCS. The relations of SE and MCTS based on SCS is not significant.

Keywords
Students Cognitive Stage (SCS), Mathematical Critical Thinking Skills (MCTS), Self Efficacy (SE)

Topic
Mathematics Education

Link: https://ifory.id/abstract/ygNtjUThpnku

Corresponding Author
Ratna Maria Desti

Institutions
IKIP SILIWANGI CIMAHI

Abstract
The National Examination is the last test faced by students on measure the achievement of learning outcomes while studying at school. It is important to prepare student to get the best result and guarantee the quality of graduates, the school organizes of the national examination preparation program. The aim of this study is to determine the strategies carried out by SMP BPK PENABUR HOLIS Bandung in improving the results of the National Examination. This study uses a qualitative approach with descriptive method. The data collected is about the planning of the National Examination program, the implementation of the National Examination program, and the results of the National Examination program. Research results (1) The strategy in improving the results of the national examinations conducted by the SMP BPK PENABUR HOLIS is good, covering the academic field (tutoring, tryouts, peer tutors) and non-academic fields (prayer meetings, elevation camp, Bina Iman and pray together before the National Examination (2) optimizing the implementation of the plan prepared by the school (3) the obstacles experienced by the school in improving the results of the national exam and its solution

Keywords
Strategy, Increase, National Examination

Topic
Mathematics Education

Link: https://ifory.id/abstract/Pxqpt4eyRXbF

Corresponding Author
Suhandri suhandri

Institutions
Universitas Pendidikan Indonesia Bandung

Abstract
Abstract This research is a quasi-experimental study with a non-equivalent control group design that aims to test the effectiveness of the application of collaborative problem-solving learning to students problem-solving abilities. The sample used in this study consisted of 75 students consisting of 37 students in the experimental class and 38 students in the control class in one of Pekanbaru Riau Middle School, Indonesia. The instrument in this study was the students initial ability test before being given treatment and tests after being given the Collaborative Problem Solving learning treatment. In this study found that problem-solving abilities, students who received Collaborative learning treatments Problem solving got better results than students who were taught with conventional learning.

Keywords
Keywords: Collaborative Problem-Solving, Problem-solving ability, Conventional learning

Topic
Mathematics Education

Link: https://ifory.id/abstract/DfNCR3HwXdQu

Corresponding Author
Vira Pratiwi

Institutions
Universitas Bhayangkara Jakarta Raya

Abstract
This research was conducted by analyzing the findings of learning obstacles. These findings are used as the development of learning trajectories of algerbaic thingking. Learning trajectories consist of systematic material about tables and diagrams in elementary schools. Problem modeling is represented through tables and diagrams from concrete levels to abstracts. This article aims to explain the process of abstraction that occurs in students through tables and diagrams. This research was conducted using qualitative methods and parts of didactical design research. This research was conducted on 5th grade of 10 students from two different schools. The results of this study are in the form of abstraction stages that are used to created algebraic thinking learning trajectories for elementary school students.

Keywords
algebraic thinking, elementary schools, tables and diagrams

Topic
Mathematics Education

Link: https://ifory.id/abstract/LXC7tK2GDcMk

Corresponding Author
SIMON MARULI PANJAITAN

Institutions
HKBP Nommensen University

Abstract
This article is about research on the study of improving students problem solving abilities in the learning process using the Problem Based Learning learning model with the Metacognitive approach. This article also contains a study of the interaction between the learning model and the students mathematical prior knowledge towards problem solving abilities, and the study of student behavior in improving mathematical problem solving skills. Research uses quantitative research methods with research subjects students in the experimental class and the control class. The research instrument consisted of tests of mathematical problem solving abilities, observation sheets and interview guidelines. Research findings include (1) the learning model used does not have a significant effect on improving mathematical problem-solving abilities, both overall and based on mathematical prior knowledge, (2) there is no interaction between learning models and mathematical prior knowledge to improve mathematical problem solving abilities , and (3) there are different behaviors between the experimental class students and control class students in improving mathematical problem solving abilities

Keywords
Mathematical Problem Solving, Problem Based Learning, Metacognitive

Topic
Mathematics Education

Link: https://ifory.id/abstract/yfNg27e98JMn

Corresponding Author
Fitri Alyani

Institutions
a) Mathematics Education Department, Universitas Muhammadiyah Prof. Dr. Hamka (UHAMKA)
b) Mathematics Education Department, Universitas Muhammadiyah Prof. Dr. Hamka (UHAMKA)

Abstract
The research was conducted at University Muhammadiyah of Prof. Dr. Hamka, Jakarta which involved three years academic level students (2012, 2014, 2015) at mathematics education department that have taken seven compulsory subjects. The students- performance consisted of mid test, final test and GPA meanwhile, the factors which influenced the students- achievement were gender and education background. This research study, there were seven variables which consisted of independent and dependent variables. Structural Equation Modelling was conducted to analyze the final model in predicting influenced factors of GPA. This research study used SmartPLS software to analyze contribution of each variables to the final outcome and dependent variable. The results of the study provide that gender was significantly influence their performance on their GPA. Education background were not directly influence their achievement in GPA but through mid test. The result study showed that final test was influenced by mid test score.

Keywords
Structural Equation Modelling; SmartPLS; Gender; Education Backgorund; Student Performance

Topic
Mathematics Education

Link: https://ifory.id/abstract/MpT4Dc3njLVh

Corresponding Author
Ratna Fitriyani Hujaemah

Institutions
IKIP Siliwangi, Jl. Terusan Jendral Sudirman Cimahi 40526

Abstract
The aims of this research was to find out the relation between self confidence and mathematical communication ability of junior high school students. The method that was used in this research was a quantitative research and its design was expost facto study. The subjects were 50 students of the first grade of SMP Negeri 2 Kutawaluya, Karawang. Questionnaires of self confidence and the mathematical communication test were used as the instrument for collecting the data of this research. Rank Spearman Formula was used to correlate both self confidence and mathematical communication ability. The result showed that there was a statistically significant correlation (0,40) between the self confidence and mathematical communication ability. The suggests that there is a correlation between self-confidence and mathematical communication skills.

Keywords
Self-confidence; Mathematical Communication Ability

Topic
Mathematics Education

Link: https://ifory.id/abstract/ZYfRnFpgyEzD

Corresponding Author
Rahmat Rahmat

Institutions
a) Mathematics Education, Faculty of Teacher Training and Education, Universitas Halu OLeo, Kendari, Indonesia *rahmat_lison[at]uho.ac.id
b) Phisics Education, Faculty of Teacher Training and Education, Universitas Halu OLeo, Kendari, Indonesia

Abstract
This study aims to analyze the improvement of geometric reasoning abilities of students of SMA Negeri 1 Sampara, Konawe Regency, Southeast Sulawesi, Indonesia. Here, we compare three models of learning; (1) GeoGebra assisted STAD cooperative model; (2) a model of the STAD cooperative without assistance from GeoGebra; and (3) direct learning models. This study was applied to three different classes, where each class consisted of high, medium and low motivation students. Data collection was done by giving a mathematics learning motivation questionnaire and giving a test of students geometric reasoning abilities. Meanwhile, the data analysis technique uses inferential statistics to test normal assumptions and homogeneity and hypothesis testing using the One-Way ANOVA Test. Based on the results of the study showed that the effect of using the STAD type cooperative learning model with the help of GeoGebra was higher when compared to the other two models. That difference occurs at all levels of motivation. On the other hand, the STAD model without GeoGebra only affects high and moderate motivation students. Meanwhile, low motivation students did not show significant differences with the direct learning model.

Keywords
Geometry Reasoning, Mathematics Learning Motivation, STAD Learning assisted by GeoGebra, STAD Learning without GeoGebra and Direct Learning.

Topic
Mathematics Education

Link: https://ifory.id/abstract/uyJE9RLrVNwM

Corresponding Author
Asep Ikin Sugandi

Institutions
1Pendidikan Matematika, Institut Keguruan dan Ilmu Pendidikan Siliwangi,
Jl. Terusan Jenderal Sudirman, Cimahi 40526, Indonesia

Abstract
Research studded for examine differences in habits of mind students- candidate teacher between the learners use metacognitive approach with usually approach. Method in this research was a quasi experiment , because existence manipulation treatment in the form of gift metacognitive approach. Population in research is all students candidate teacher at IKIP Siliwangi , while the sample selected two class from force in 2016. The instrument used in research was a set of questionnaire which contains 32 question. Processing data entirely use Microsoft Excel and SPSS 22. From the results data processing obtained conclusion that habits of mind students- candidate teacher whose learning using metacognitive approach better than from usually approach.

Keywords
habits of mind, metacognitive approach

Topic
Mathematics Education

Link: https://ifory.id/abstract/h2y347JkpHWt

Corresponding Author
Citra Megiana Pertiwi

Institutions
Faculty of mathematics and science education, IKIP Siliwangi
Jalan Terusan Jenderal Sudirman, Cimahi, Jawa Barat, Indonesia

Abstract
This research aimed to analyze the role of Realistic Mathematics Education (RME) approach with GeoGebra in enhancement, achievement, and phenomena of Mathematical Inductive Reasoning Ability (MIRA) and Mathematical Self-Confidence (MSC) of Junior High School students-, and due to no research on the dependent variable and independent variable together yet. The method used was experimental research with a pretest-posttest Control Group Design. In this research, the population was all 7th graders in Cimahi City. The research sample was 69 students consisted of two classes that were randomly selected and divided into experimental and control classes in a school. The instrument used an essay test on MIRA and MSC scale. The results showed that: (1) Significant enhancement and achievement of MIRA and MSC for students who learned through RME with GeoGebra were better than the Ordinary Learning, (2) Students- achievement of MIRA through RME with GeoGebra was at a strong level and for students with ordinary learning was at a sufficient level, (3) Students- achievement of MSC through RME with GeoGebra and students- with ordinary learning were at a good level, (4) Students- MIRA on the indicator explained that the model had not been achieved ideally.

Keywords
Reasoning; Self-Confidence; Realistic; GeoGebra

Topic
Mathematics Education

Link: https://ifory.id/abstract/pC4HAENPGTbk

Corresponding Author
M Arif Kamal

Institutions
(a,b,c) Department of Agroindustrial Technology
Faculty of Agricultural Technology
Universitas Brawijaya

Abstract
Orange Fruit Batu 55 is a typical plant from the City of Batu Jawa in addition to apple plants. This orange has the advantage of sweet, fresh and harvest times 3 times a year. The level of competition is quite high in the market, making the Batu 55 tangerine fruit must be able to survive especially facing the onslaught of imported products. Increasing the level of dependence and complexity of the current supply chain network makes supply chains as a whole more vulnerable to disruption. This study aims to describe the supply chain using the framework of the Food Supply Chain Network, measure supply chain performance, and identify the implementation of traceability systems in Batu Keprok 55 fruit.

Keywords
SCOR, Orange Fruit, Keprok Batu 55, traceability

Topic
AGROINDUSTRIAL PRODUCTION SYSTEM MANAGEMENT AND REGULATION

Link: https://ifory.id/abstract/AMQJTxvfDj9q

Corresponding Author
Yusi Nur Apriyani

Institutions
a) Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia
*yusinurapriyani[at]upi.edu
b) Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia

Abstract
The pupose of this study is to determine the learning obstacle that student experience on basic trigonometric equations. This study used descriptive qualitative method employing phenomenological research design. The focus of the phenomenon in this study is the obstacles that student experience in basic trigonometric equations. Data was collected through a test that was tested on 11th grade students who had learned basic trigonometric equations. Based on the result of this study, 2 (two) catagories of learning obstacles that student experienced in basic trigonometric equations have ben identified such as learning obstacle of concept image and learning obstacle in mathematical representasion.

Keywords
Learning obstacle; Trigonometric Equations

Topic
Mathematics Education

Link: https://ifory.id/abstract/47Entmpf9URF

Corresponding Author
Dodyk Pranowo

Institutions
Brawijaya University

Abstract
Peoples lifestyles changing have an impact to obesity. According to Nagao et al (2009), polyphenol-s content in Green Coffee have potential to reduce the accumulation of visceral fat, so it can decrease total cholesterol level significantly. Green coffee has a bad taste to be consumed, then research about polyphenol extraction to process as high value products is needed. The purpose of research was to determine the optimal combination of solvent concentration and solvent addition ratio for the highest extraction yield and polyphenol-s content. This research was arranged using Response Surface Method (RSM) with Central Composite Design (CCD) with 2 factors, solvent concentration (60-90%) and the ratio of solvent addition (20-40 ml/gram) and the response are total phenol and extraction yield. The optimum condition were the treatment with 84,92% solvent concentration and 40 ml/gram solvent ratio with desirability 0,870 (87%). The result of program prediction produces total phenol 534,504 mg GAE/gram and yield extract 17,17999%. The optimal solution was verified, the result of total phenol is 538.8261 mg GAE / gram and the yield is 15.39%. The extract contain of caffeine 25,567%, antioxidants activity with IC50 values 67,6 ppm (where in 67,6 ppm concentration of solution can prevent 50% free radicals). If it-s compared with vitamin C in the market, IC50 value of vitamin C is lower than green coffee extract, with the value of 47,68 ppm it means antioxidants activity in green coffee extract is lower than vitamin C.

Keywords
Extraction, Green Coffee, Optimization, Polyphenol, Response Surface Methodology

Topic
AGRICULTURAL PRODUCT TECHNOLOGY

Link: https://ifory.id/abstract/Xp8b37hwZ9Wk

Corresponding Author
Findinilah Faraswati

Institutions
1)Departemen Pendidikan Matematika, Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia
*findinilah.faraswati[at]upi.edu
2)Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia

Abstract
The underlying problem of this research is the lack of students competencies in understanding the concept area of triangle in geometry as the results of the teaching and learning pattern that only receiving information rather than to construct knowledge. The process of construct knowledge by students during learning requires high attention and motivation from students for learning which is then facilitated by the teacher. The purpose of this research is to develop the didactical design of area of triangle that is to construct knowledge and motivation to learn geometry involving student motor action. The used research method is a qualitative research in the form of the didactical design research through three phases of analysis i.e. didactical situation analysis, metapedadidactical analysis, and retrospective analysis, which conducted in students from 7th grade at one of public schools in West Bandung Regency. Based on the results of research and analysis, the didactical designs that has been made is capable to change students learning habit, construct students learning motivation and are quite capable of developing students competencies in the concept of triangle area.

Keywords
motoric action; didactical design; learning of triangle area

Topic
Mathematics Education

Link: https://ifory.id/abstract/qWXzrVme2uBp

Corresponding Author
Dodyk Pranowo

Institutions
Brawijaya University

Abstract
Bleaching is the most critical stage to improve the appearance, flavor, taste and stability of the final oil products in Crude Palm Oil (CPO) refining process. Bleaching process using a clay called bleaching earth (BE). The used BE will become a waste called spent bleaching earth (SBE). The surface of SBE is covered by impurities which are carried by CPO purification process so it cannot be reused. Regeneration using acid can increase the absorption capacity of SBE. The purpose research is to find the optimal combination of nitric acid concentration and heating temperature in the regeneration process of spent bleaching earth, so it can be reused as an adsorbent in refining crude palm oil. The research was arranged using Response Surface Method (RSM) with Central Composite Design (CCD) using 2 factors, concentration of nitric acid (0.4 M; 0.7 M; and 1 M) and heating temperature (100oC, 300oC and 500oC) and the response are color absorption efficiency and yield. The optimum condition was the treatment with the concentration of nitric acid 0.75 M and heating temperature 430.82oC. The result of prediction program produces color absorption efficiency 95.7557%, yield 52.4846%. The optimal solution was verified, the results of color absorption efficiency is 94,68% and yield is 51,43%. RSBE result from optimum condition is compared to BE. The value of color absorption efficiency using BE is 96.77%, while in RSBE with optimum conditions is 94.68%. The value of RSBE color absorption efficiency of optimum conditions approaches the value of BE color absorption efficiency.

Keywords
Spent Bleaching Earth, Bleaching Earth, Bentonite, Regeneration, Respon Surface Methodology

Topic
WASTE AND ENVIRONMENTAL MANAGEMENT

Link: https://ifory.id/abstract/AFJMTr7qGbcW

Corresponding Author
Irfan Muhafidin -

Institutions
Universitas Pendidikan Indonesia

Abstract
The research aims to understand the ability of problem solving in Mathematical problem based on Montague Strategy. The methods of the research is descriptive qualitative methods. The data collection is examination and interview. The subject of the research is the students of senior high school in Bandung. The results of the research is one student has good ability, three students are average ability, and the last one has low ability

Keywords
Problem Solving, Qualitative, Montague Strategy

Topic
Mathematics Education

Link: https://ifory.id/abstract/6TF74EeQkmDq

Corresponding Author
Findinilah Faraswati

Institutions
1) Departemen Pendidikan Matematika, Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia
*findinilah.faraswati[at]upi.edu
2) Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia

Abstract
The underlying problem of this research is the importance of assessment in building mathematics learning. Assessments cannot be viewed separately from learning, but both are mutually integrated. The purpose of this research is to obtain an overview of the facts in the field related to the views of mathematics teachers on the assessment and implementation of assessment in the 2013 curriculum. The used research method is a qualitative research with a case study approach which conducted in teachers from elementary and junior high schools in Bandung and West Bandung Regency. The results of this research are obtained the fact that the teacher implementation the assessment of learning, but has not optimized the assessment as learning and assessment for learning.

Keywords
impelementation of assessment; mathematics learning

Topic
Mathematics Education

Link: https://ifory.id/abstract/ARm7ekMQLxru

Corresponding Author
Endang Rusyaman

Institutions
Department of Mathematics Universitas Padjadjaran, Bandung, Indonesia

Abstract
Fractional differential equation is an ordinary differential equation in which the order is fractional number. It can be said that fractional differential equation is a generalization of an ordinary differential equation where the order is natural number. In this paper, a fractional differential equation with the order α and β, where α and β are rational numbers, is introduced. Solution of this differential equation is found by using Laplace transformation and presented in the form the Mittag-Leffler function. Graph of solutions function are then described by using the Matlab software.

Keywords
Differential equations, Fractional order, Laplace Transform, Mittag-Leffler

Topic
Applied Mathematics

Link: https://ifory.id/abstract/V8PJjwYKgRu9

Corresponding Author
Azela Fitri

Institutions
1Department of Mathematics Education, Sriwijaya University, South Sumatera
Jl. Srijaya Negara, Bukit Lama, Ilir Barat I, Palembang, South Sumatera, Indonesia

Abstract
This study aims to know the characteristics of the jumping task which valid, practical and useful supporting junior high school students learning algebraic form operation . This research uses design research as a method. this research uses PMRI approach with avengers end game movie context and LSLC system. This study involved students who had low, medium, and high ablities in junior high school 18 Palembang. Data collection conducted through video recordings and photos to see the learning process in the classroom, jumping task, observation and interviews during the learning process with the students which is the subject of research. Research produced jumping task of learning addition and subtraction of algebraic form dealing with the avenger movie. Results of this research are valid and practical jumping tasks on mathematics topic algebraic form operation. Students with low performance have difficulties in solving jumping tasks. However, with LSLC system, students can answer the algebraic form operation jumping tasks.

Keywords
Design Research, PMRI, LSLC, Jumping Task

Topic
Mathematics Education

Link: https://ifory.id/abstract/zFHkKPqL2WuG

Corresponding Author
SUJINAL ARIFIN

Institutions
(1) Mathematics Education Department of UIN Raden Fatah Palembang,
(2) Mathematics Education Department of Sriwijaya University

Abstract
This research is a descriptive qualitative research that aims to describe and examine problem-solving ability and the strategies used high school students for context “tourists attractions in Palembang”. The subjects of this study were 6 high school students in Palembang that consisting of 2 high-ability students, 2 medium-ability students, and 2 low-ability students. Data obtained through written test and interview. Based on analysis of students- solution showed that differences problem-solving strategies used students. high-ability students used more than three problem-solving strategies. Medium-ability students used two problem-solving strategies, and low-ability students employed only one strategy. The most frequently used strategies were looking for patterns, logical reasoning, making a model or diagram, trial and error.

Keywords
problem-solving ability, strategies, context, tourist attractions

Topic
Mathematics Education

Link: https://ifory.id/abstract/pxqNGCKXghM3

Corresponding Author
ELY SUSANTI

Institutions
1,2,3 Mathematic Education, Sriwijaya University, Palembang, Indonesia

Abstract
This study was purposed to describe effect of using innovative learning models for mathematical thinking high school students in Palembang. In this research, mathematical thinking only focus on aspect abstraction and representation. This study was experimental research. The data collection used test and interview. The data analysis used two ways anova. Based on the data analysis, the conclusions is there were no differences in the mathematical thinking between students who worked under creative problem-solving (CPS) and problem-based learning. Based on analysis students- solution, most of students used numeric and algebraic representation, and few students used visual and symbolic representation. Besides that, from abstraction aspect, most of student do specialization, observation of pattern and generalization.

Keywords
innovative learning, creative problem-solving, problem-based learning, mathematical thinking

Topic
Mathematics Education

Link: https://ifory.id/abstract/UzjVMEQWtaJH

Corresponding Author
Duano Sapta Nusantara

Institutions
1Department of Mathematics Education, Sriwijaya University, South Sumatera
Jl. Srijaya Negara, Bukit Lama, Ilir Barat I, Palembang, South Sumatera, Indonesia

Abstract
The uniqueness of Pisa tower has always been a mystery and drawn the attention. On the other hand, the revised 2013 curriculum demands the use of context which can stimulate the students to solve daily life problem. This research aimed to produce a mathematical problem by using Pisa tower as the context that is valid and practical. The method research used was design research with development studies type which consisted of two stages, namely: the preliminary and formative evaluation. The techniques used for collecting data were walkthrough, document reviews, observation, and interviews. This research involved eighth-grade students which consisting of 12 students who had various capabilities. This research produced a mathematical problem about estimating the leaning tower of Pisa. Based on the research result, the developed problem had 1) Validity regarding content, context, and language from the assessment of expert reviews and one to one, 2) Practicality that can be seen from the developed problem, could be easy to understand by students. In addition, the Pisa tower context could develop students- mathematical representation skills such as building mathematics through mathematical model, solving the problem involving mathematical expressions and making the situations based on the problem given.

Keywords
PMRI; Design Research; HOTs; Slope of Straight Line

Topic
Mathematics Education

Link: https://ifory.id/abstract/mgGkNp62eFRZ