Indonesia Conference Directory

Corresponding Author
Yumiati Yumiati

Institutions
Universitas Terbuka, Universitas Bengkulu

Abstract
This study aimed to improve the ability of the understanding of semigroup concept through Concept Attainment Model. The method of this study was quasi experiment. The design of this study used one group pretest posttest design. The sample of the study was 34 students of the Study Program of Mathematics Education at Teacher Training and Education Faculty, Universitas Bengkulu at the subject of Abstract Algebra of Even Semester Academic Year 2018-2019. The instrument used in this study was a test about semigroup concept containing 4 items. The data was analyzed qualitatively and quantitatively. The results of this study were: 1) the improvement of the students- ability of the understanding of semigroup concept was 0.68, including the medium category; 2) the achievement of the ability of the understanding of semigroup concept was 75.44, including the high category.

Keywords
Semigroup, Concept attainment

Topic
Mathematics Education

Link: https://ifory.id/abstract/WPyZYLfBQ4Tt

Corresponding Author
abdul wahab abdulah

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

Abstract
The background of this research is to know the needs of learning approach to deal with the ability of student in vocational high school to solve problems and their mathematic independent. The alternative approach applied is contextual approach. This research purpose is to find out the achievement and the increase of their ability in solving problems and their mathematic independent. Research methodology used in this research is experiment method. In the beginning and in the end of learning both of the class given test and non-test. Population of this research is vocational students which has intermediate skill in Bandung Barat residence, sample taken from two class randomly, the sample is X TKJ 2 as experiment class and X TKJ 3 class as control class. Instrument of the research is a test consist of 8 essay questions and 30 non-test questions. The solving problems ability and math independent then analyze using average differential test. The result of the research shows that the achievement and the ability of solving problems and math independent increasing using contextual approach than conventional approach.

Keywords
Solving Problem Ability, independence, contextual approach

Topic
Mathematics Education

Link: https://ifory.id/abstract/DhHCp3YvRAXk

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
tommy tanu wijaya

Institutions
IKIP Siliwangi

Abstract
Abstract. The purpose of this research is to know the effect of learning media on the junior high school students- critical thinking skills on the topic of plane geometry by using hawgent dynamic mathematical software. The sample of this research would be 9th grade student in one of the junior high school in Cimahi with a total of 30 students in the school year of 2019/2020. The collection of the data is by using pre-test and post test to compare the critical thinking skills of the experimental class with the controlled class. The result of this research is that hawgent dynamic mathematical software boost the students- critical thinking skills and also comparing the increase of students- critical thinking skills on the topic of plane geometry.

Keywords
Hawgent dynamic mathematical software, plane geometry, junior high school

Topic
Mathematics Education

Link: https://ifory.id/abstract/M8n92mdJLYNT

Corresponding Author
Nur Widiati Helmi

Institutions
IKIP SILIWANGI

Abstract
One method that can optimize the learning process is through inquiry methods. Thus learning inquiry methods supports students to discover, students are encouraged to learn mostly through their own active involvement with concepts and principles, and teachers encourage students to have experience and conduct experiments that allow them to find principles for themselves own. The purpose of inquiry teaching helps students to form questions, look for answers or solutions to satisfy their curiosity and to help their theories and ideas about the world. The problems that researchers revealed were: 1) Whether through inquiry methods can improve students critical thinking skills in the material to construct flat side spaces. The method used in this study is a test method in the form of several description tests. The results the researchers got were 1) Inquiry Methods can improve students critical thinking skills in learning to build flat side spaces. Based on the percentage of students thinking ability tests the student learning outcomes classically average reaches a high category, and it occurs from pre-PTK to post PTK

Keywords
Critical Thinking, Inquiry Method

Topic
Mathematics Education

Link: https://ifory.id/abstract/xKcHN2nF7EDq

Corresponding Author
kusmawan kusmawan

Institutions
IKIP Siliwangi

Abstract
This study is a classroom action research that aims to improve students mathematical reasoning abilities through a demonstration learning approach. This research was motivated by observations in class VII of SMP Negeri 2 Cilawu, Garut Regency, that students mathematical reasoning ability in Mathematics subjects was very low, that is, the average of each indicator only reached 3.2. The subjects of this study were seventh grade students of SMP Negeri 2 Cilawu 2018/2019 academic year. This research was carried out in 3 cycles. Stages in each cycle included planning, action, observation, reflection. Instruments used to measure students mathematical reasoning abilities used a description test given at the end of each cycle. Based on the results of the study obtained data as follows: in cycle I students reasoning abilities gained an average of 45.25. In the second cycle obtained an average of 56.5. In the third cycle obtained an average of 68.75. So the authors conclude that with a learning approach demonstration of students reasoning abilities increases

Keywords
mathematical reasoning,demonstration learning approach

Topic
Mathematics Education

Link: https://ifory.id/abstract/y4tTpeNGrDQX

Corresponding Author
Ayathollah Khomeni

Institutions
a) Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setia Budhi
No. 229, Bandung 40154, Indonesia
b)Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setia Budhi
No. 229, Bandung 40154, Indonesia

Abstract
This study aims to determine the increase of student learning activeness through the demonstration method of concrete objects in the line and angle material in Junior High School. This type of research was Class Action Research conducted collaboratively between teacher and researcher at MTsN Batang Toru. The research subjects were 40 students of class VII-4. Data collection techniques were carried out by observation and distribution of questionnaires. The data analysis technique used is the analysis of the Miles and Huberman models with three stages, namely data reduction, data display, and drawing conclusions. This research through three cycles to obtain the desired results. The results of this study indicate that student learning activeness increases significantly. The results of the observation during the learning process showed the observations of the first cycle, the first meeting, the activity of students was 34.82%, and the second meeting was 42.33%. The 1st cycle of the 1st meeting was 51.5%, the second meeting was 63.83%. The third cycle of the 1st meeting was 74.16%, at the second meeting increased by 85.16%. Moreover, measuring the level of student activity was carried out by distributing questionnaires at the end of each cycle. The results of the questionnaire showed that respectively in the first cycle reached 44.16%, the second cycle 64.16, and the third cycle 84.33%. It can be concluded that the activeness of students in line material and angles in mathematics lessons using the concrete object demonstration method increases as expected.

Keywords
Increased of Student Liveliness in Learning, demonstrating concrete objects method.

Topic
Mathematics Education

Link: https://ifory.id/abstract/EzGUHAgK6qDh

Corresponding Author
Hafiziani Eka Putri

Institutions
Universitas Pendidikan Indonesia

Abstract
The present study is aimed at investigating the influence of Concrete Pictorial Abstract (CPA) approach to the improvement of elementary school students- Self Efficacy Mathematics (SEM) seen from Mathematical Prior Ability (MPA) and as a whole. It is a quasi-experiment with control design of pre-scale and post-scale in Mathematics in the topic of 3 dimension geometry (3D geometry) to 119 elementary school students in Puwakarta Subang Bekasi (Purwasukasi), West Java. The present study is conducted by using two study groups, a group which implements CPA learning approach as the experimental group and group which implements conventional learning as the control group. Both descriptive and inferential data analysis show that the improvement of students- SEM is better in students with CPA learning approach rather than students with conventional learning, seen as a whole and in every MPA. Therefore, CPA learning can improve elementary school students- SEM.

Keywords
Concrete Pictorial Abstract (CPA) aproach, self-efficacy

Topic
Mathematics Education

Link: https://ifory.id/abstract/rR9W3xZPJUnt

Corresponding Author
Yerizon Yerizon

Institutions
Universitas Negeri Padang

Abstract
The ability of mathematical reasoning is one of the abilities that must be possessed by every student in mathematics learning.However, the 8th grade of mathematics in Junior High School number 2 Pariaman, students mathematical reasoning ability is not optimal.Discovery learning is one of the learning models that can improve the ability of mathematical reasoning.The purpose of this research is to see and describe the differences in the ability of students mathematical reasoning using discovery learning model with the ability of students mathematical reasoning using conventional learning.The type of this research is quasi-experiment with the Static Group Design. Based on data analysis the result of the last test that the ability of students mathematical reasoning using discovery learning model is better than the ability of students mathematical reasoning using conventional learning.

Keywords
Discovery Learning Model, Mathematics Learning, The Ability of Mathematical Reasoning.

Topic
Mathematics Education

Link: https://ifory.id/abstract/ep2FGH4EaTLb

Corresponding Author
Nur Ayu Anggraeni

Institutions
Institut Agama Islam Negeri Bengkulu

Abstract
This research is intended to answer the problem of how to inculcate the values ​​of character education in the VII grade Mathematics learning process at SMP Negeri 10 Bengkulu City, this is due to the prevalence of people who begin to commit dishonest deeds, such as drug use, adherence to moral degredation, therefore the need for the integration of the values ​​of character education in adolescents, especially in the process of learning mathematics. The problem was discussed in one field which was carried out at SMP 10 Bengkulu City. Research data obtained by free interview and observation. All data were analyzed with a phenomenological approach and descriptive analysis using induction logic, deduction, and reflection. The results showed that the values ​​of character education in grade VII mathematics material included religious character values, good personal character values, social care character values, honesty character values ​​and hard work character values ​​that could be embedded through the mathematics learning process. The way the teacher instills these character values ​​is by getting used to reading prayers before and after learning, giving direction so that students are enthusiastic about learning mathematics and giving examples of problems related to daily life.

Keywords
Character Education, Mathematics Learning

Topic
Mathematics Education

Link: https://ifory.id/abstract/CnAyfKBeD6rp

Corresponding Author
Anggi Arini

Institutions
a) Master of Mathematics Education, Sriwijaya University, Jalan Srijaya Negara, Kelurahan. Bukit Lama, Kecamatan.Ilir Barat I, Bukit Palembang 30128, Indonesia

Ratu.ilma[at]yahoo.com

b) Master of Mathematics Education, Sriwijaya University, Jalan Srijaya Negara, Kelurahan. Bukit Lama, Kecamatan.Ilir Barat I, Bukit Palembang 30128, Indonesia

Abstract
This study aimed to produce learning trajectories that could help the students to learn integer addition and subtraction. The method of this study used research design with the initial stages of preparation (preparing for the experiment), design experiment (design experiment), and retrospective analysis (retrospective analysis). The learning approach used Indonesian Realistic Mathematics Education (PMRI). The subjects in this study were seventh-grade students of SMP Negeri 01 Palembang, Indonesia. Data collection was done through observation of student activities, documentation of events in the classroom in the form of photos and videos, and collection of student tasks. The results of this study produced 5 problem addition and 5 subtraction of integer that who were able to help students understand the concept of addition and subtraction of integers could be triggered by using of Eid cakes as a context in learning and students who were able to solve problems in everyday life related to addition and subtraction of integers.

Keywords
Addition of integer, Subtraction of integers, PMRI

Topic
Mathematics Education

Link: https://ifory.id/abstract/C3YJ4DxRXPFe

Corresponding Author
sudirman sudirman

Institutions
a) Universitas Wiralodra, Jln. Ir. H. Juanda Km 3 Indramayu 45211, Indonesia
*sudirman[at]unwir.ac.id
b) Universitas Pasundan, Jl. Sumatera No.41, Babakan Ciamis, Sumur Bandung, Kota Bandung, Jawa Barat 40117, Indonesia

Abstract
This study integrated ethnomathematics into augmented reality technology (AR) with the aim of assisting mathematics pre-service teachers- learnin geometry technology. The research used was ADDIE (Analysis, Design, Development, Implementation, and Evaluation) approach. The stages used in this study consisted of (1) exploration; (2) design, (3) development; and (4) implementation. This study used two data analysis techniques: (1) qualitative was conducted for exploration studies, describing the design and development process; (2) quantitative was conducted to investigate the result of the use of integrated ethnomathematics AR technology implementation to 56 Mathematics pre-service teachers- at Indramayu, Indonesia. The results showed that (1) ethnomathematics values in the form of uma lengge traditional house, ethnic karo houses, wa rebo traditional house, demak grand mosque, kaghati kolape kite can be used as marker objects on augmented reality technology and to explain geometry concept;. (2) The design stages consist of designing integration concepts, AR interfaces, and learning system development;. (3) The results of implementation analysis can (a) help to increase learning interaction activities (b) improve the understanding of concepts and geometry visualization, (c) provides information to Mathematics pre-service teachers-related to ethnomathematics and local wisdom in Indonesia.

Keywords
Ethnomathematics; Augmented Reality (AR) Technology; Geometry Learning; Mathematics pre-service teachers-

Topic
Mathematics Education

Link: https://ifory.id/abstract/EHM7CYZVxNQq

Corresponding Author
Yuyu Yuhana

Institutions
a,b,c,d Mathematic Education Department, University of Sultan Ageng Tirtayasa, Serang, Banten
*hepsinindiasari[at]yahoo.co.id

Abstract
Pedagogical knowledge of prospective mathematics teachers is very important to be mastered, but still students of prospective teachers are still low in relation to the tightening. In addition, prospective teacher students are rarely trained to develop reflective thinking skills. Reflective thinking is very important to sharpen critical thinking skills and other high-level thinking skills. Scaffolding is assistance given to someone and if the person has been able to help it is gradually reduced. Thus teaching materials are needed to develop the ability of reflective thinking for pedagogical knowledge. This study aims to look at the effectiveness of Scaffolding interactive teaching materials in the ability of reflective thinking on pedagogical knowledge of prospective mathematics teachers. This research method is quasi-experimental with noneqivalent pretest-postest control group design. This study uses 2 classes which are given interactive Scaffolding teaching materials and the other classes apply ordinary teaching materials but are guided by scaffolding. The instruments used were tests, questionnaires, and interviews. The conclusion of this study is that the reflective ability associated with pedagogical knowledge provided by Scaffolding interactive teaching materials is better than those using ordinary teaching materials with Scaffolding.

Keywords
Scaffolding, Interactive, Reflective, Pedagogic

Topic
Mathematics Education

Link: https://ifory.id/abstract/2KcjyvE8hrtb

Corresponding Author
Inne Marthyane Pratiwi

Institutions
a) Universitas Islam Negeri Sunan Gunung Djati
Jalan A.H. Nasution No. 105, Bandung, Jawa Barat, Indonesia
b) SDN Bantarmangu 01
Jalan Gunungtiga, Cimanggu, Cilacap, Jawa Tengah, Indonesia

Abstract
Numeracy literacy deals with the application of mathematical concepts in daily life. In this study, the worksheets are designed to present mathematical concepts in daily life by using story problem. Students are presumed to be able to solve story problem if they can understand the meaning of the problem. Thus, students can find problem that need to be solved in the right way. This study aims to investigate the correlation between mathematical understanding skill with reading comprehension skill of elementary school students. The study implemented the correlation method by involving 4th grade students in two elementary schools. Data collection techniques used technical tests. Then, the data is analyzed by simple regression test. The result of the study shows that there is a positive correlation between mathematical understanding skill with reading comprehension skill of elementary school students. The students not only understand mathematical concept and gain reading comprehension skill but also know about Indonesian local wisdom. This is due to the concept of story problem integrated with local wisdom material.

Keywords
local wisdom, mathematical understanding, reading comprehension, story problem

Topic
Mathematics Education

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

Corresponding Author
Bagus Eko Nugroho

Institutions
Universitas Sebelas Maret

Abstract
Mathematics has an important role in development in all aspects of life. Through mathematical modeling, students can be trained to think critically and creatively in solving problems related to everyday life. The habit of critical thinking using intuition can help determine the initial steps and bring up creative ideas in solving the problems they face. This study aims to describe the characteristics of the intuitive reasoning model of students of rational personality types in solving HOTS problems in mathematics. The subjects in this study were grade VIII students of DAHA 1 PAWYATAN SMP Kediri who had been selected based on rational personality types through Kierseys personality test. The intuition data used by the subjects in this study were collected using task-based interviews. The results of this study are that the subjects did not rewrite the important things in the question when answering, such as what is known and what was asked by arguing that this is usually true. In general the subjects in this study used an implicit intuitive reasoning model and diagrammatic model to solve the HOTS problem given.

Keywords
intuition characteristic; hots; rational personality type

Topic
Mathematics Education

Link: https://ifory.id/abstract/r7cbDveaXyPG

Corresponding Author
Harun Abdul Rohman

Institutions
(a) Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia

*Harun88pltg[at]upi.edu

Abstract
An ellipse can be obtained through the conic section, if the plane intersects one of the pieces of the cone and its axis but is not perpendicular to the axis, the intersection will be an ellipse. Besides that, a circular cylinder cut by a plane that has a slope between 0 degrees and 90 degrees against the base of the circular cylinder, the intersection forms an ellipse. The purpose of this study that 1) determine the equation of the ellipse in terms of the circular cylinder section approach and 2) determine the area of the ellipse in terms of the circular cylinder section approach. The method we used in this research is literature studies from several books that are relevant to research. The results showed that 1) the equation of ellipse can be derived from the approach of circular cylinder section and 2) the area of ellipse can be obtained using the circular cylinder section approach. We conclude using this circular cylinder section approach, we can obtain the same formula both for equation and area as the conic section.

Keywords
the circular cylinder section, the equation of ellipse, the area of ellipse

Topic
Mathematics Education

Link: https://ifory.id/abstract/BXz4vpfWuyQk

Corresponding Author
Venny Iswantiningtyas

Institutions
1,2,3) Universitas Nusantara PGRI Kediri

Abstract
Play and Games are two aspects that are familiar and very close to children. The game can be an effective learning tool for early childhood. Traditional Javanese games can be a learning suggestion for kindergarten students to practice social skills and introducing mathematics in a fun way. Children will be more interested in learning mathematics. This study aims to develop traditional Javanese games that can train the ability to socialize and introducing mathematics from an early age. Traditional games developed include Dakon and Gejlig. The development of traditional games is based on the needs of kindergarten students to learn mathematics and learn to socialize. The sample in this study were kindergarten students who were invited to study mathematics while playing. Two of the games taught to children are Dakon and Gejlig. The Dakon game is played by two students. Through the Dakon game, students are trained to learn to count and recognize simple addition and subtraction operations by counting the seeds played. Students who win are students who at the end of the game Dakon get more seeds than their friends. In the game of Gejlig, the number of students playing is not only two, but can be in groups of four or five students. In this game students can take turns jumping on a flat building that has been arranged on the floor / ground. If the traditional game is usually, flat buildings drawn only in the form of a square or half circle, in this study students are free to create their own set of flat building that they will use to play. Thus, students know more about waking up flat through the game of Gejilg. Javanese Traditional games can be an interesting media for early childhood to learn mathematics and learn to socialize with their peers. The results of this study indicate that through traditional Javanese games, there are many mathematical concepts that can be taught to students, such as the concept of addition and subtraction and shapes.

Keywords
Kindergarten, Mathematics for Early Age, Javanese Traditional Games, Shapes, Mathematics Operation

Topic
Mathematics Education

Link: https://ifory.id/abstract/En2NPgMVdrR3

Corresponding Author
Sulafah Ansya Saskiyah

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

*)ratu.ilma[at]yahoo.com

Abstract
Jumping task is the central part of teaching that uses Higher Order Thinking Skills (HOTS). The revised 2013 Curriculum in Indonesia emphasizes learning using HOTs, and the daily life context. This research aimed to find out the characteristic of jumping task which valid, practical, and also useful for supporting secondary schools students learning fractional operations using PMRI with the context of kain jumputan. The subject of this research was seventh-grade students of secondary school in Palembang. The research uses the method of design research with development studies type which had two stages: the preliminary and formative evaluation. This research only presented the result on self-evaluation, expert reviews and one-to-one, and small group phase. Data collection techniques using walkthrough, documentation, observation, and interviews. PMRI is used as material content and context for this research. Moreover, the Lesson Study for Learning Community (LSLC) is used in designing and implementing the learning process. The result of this research was produced mathematics problem about addition and subtraction fractional operations through the context of kain jumputan. This research is valid and practical jumping tasks on fractional operations using PMRI with the context of kain jumputan. Validity could be seen from the assessment of validator (expert) regarding content, construct, and language used in one-to-one phase. Practicality could be seen where the students could understand the language and the content of the questions that are in the jumping task. Thus, the context of kain jumputan can help students in representing problem by involving mathematical expressions.

Keywords
PMRI; Fractional Operations; LSLC; Design Research

Topic
Mathematics Education

Link: https://ifory.id/abstract/eFUX3JMKrxfv

Corresponding Author
Dahlia Fisher

Institutions
Universitas Pendidikan Indonesia
FKIP Unpas

Abstract
This study aims to determine students mathematical reasoning abilities on systems of linear equations and aplications. This research was conducted in the odd semester of the 2018/2019 academic year. The population in this study were all students of class VIII in one of the Junior High School in Bandung with a total sample of 32 students. The research instrument used in the form of test mathematical reasoning abilities. The research method used is qualitative research design. Data were analyzed using data reduction, data presentation, and conclusion. Based on the results of the study it can be concluded that the mathematical reasoning ability of junior high school students in systems of linear equations and aplications is still low.

Keywords
mathematical reasoning ability, systems of linear equations and aplications

Topic
Mathematics Education

Link: https://ifory.id/abstract/3kAUJjKZE7Fn

Corresponding Author
Aan Hasanah

Institutions
a) Departemen Pendidikan Matematika, Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia
b) Departemen Pendidikan Kimia, Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia

Abstract
Ability of problem solving is closely related to representation. A complicated problem would be much simpler when the utilization of representation is in accordance with problem. Process of developing representation is influenced by the proper perception and precise comprehension of basic concept. This paper discusses the result of study which uses quantitative method to analyze statistically the difference problem solving ability that is related to level of basic concept ability namely: low, mediocre, and high as well as analyze statistically the difference of problem solving ability based on types of representation that is abstract, visual, and multiple toward the science problem. This study is conducted at four primary schools involving 137 students in Bandung, Indonesia. The result of study shows that there is the difference of problem solving ability related to level of basic concept ability however there is no difference problem solving ability based on the types of representation.

Keywords
Representation, Problem Solving

Topic
Mathematics Education

Link: https://ifory.id/abstract/m4vnxUqZTg9r

Corresponding Author
Ratni Purwasih

Institutions
IKIP SILIWANGI
Mathematics Education
jln. Terusan Jenderal Sudirman, Cimahi

Abstract
Mathematical creative thinking is the ability of students to find solving ways that are unusual, unique, and have never been found by others. The development of the concept of mathematical creative thinking can make students despair and give up, so that another ability is needed so that they are able to survive and turn their difficulties to be opportunities for themselves to advance. This study aims to determine the mathematical creative thinking ability of class VIII junior high school students in one of the junior high schools in Bandung Barat on the subject to construct plane and solid geometry based on gender differences. The samples are 4 students consisting of two men and two women. Besides that, the discussion of mathematical creative thinking skills for junior high school students is viewed from gender differences, between male and female students in terms of their creative thinking abilities. The instrument of this research is a test of the ability to think creatively and interview. This study is a descriptive qualitative research that aims to describe the ability of creative thinking mathematically in solving problems of plane and solid geometry. The results show that the ability difference between male and female students is that the female students have much better mathematical creative thinking. In addition to gender factors, other factors can also influence the achievement of creative thinking skills; namely, students and teachers- readiness to learn, students- basic abilities and knowledge of mathematical concepts. Male students are more detailed in explaining the shape of each space given to the problem.

Keywords
Mathematical creative thinking ability, Gender

Topic
Mathematics Education

Link: https://ifory.id/abstract/6HCjhTf2BGUP

Corresponding Author
BONITA CHINDIANI N

Institutions
a) Post Graduate School, Indonesia University of Education
Jl. DR. Setiabudi No 229, Bandung, Indonesia,
bonitachindianin[at]upi.edu
b) Indonesia University of Education

Abstract
Justification ability can support other mathematical abilities and dispotions and can confirm student-s understanding. It is very important to able to know the student-s justification abilities. The purpose of this study was to determine mathematical justification ability of the first middle student, using qualitative methods from 21 student in one of junior high school in Bandung. Students are given triangle and quadrilateral question to do justification. The result showed that there are 3 level justification of junior high school student. The first level is students assume based on their own thinking, the second level is student explain with mathematical concept but are less precise and the third is student explain with the right and complete mathematical concepts. But when justification involving calculatios, generally student can do justification correctly only a few student make mistake because of miscalculation.

Keywords
Justification

Topic
Mathematics Education

Link: https://ifory.id/abstract/wpkxYA7qbDFP

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
Armiati Armiati

Institutions
Universitas Negeri Padang

Abstract
This paper discusses about of designing mathematics learning for technology vocational school students. The two-variable linear equation system is one of the topics taught to students in vocational schools. Learning the topic of two-variable linear equation systems has been designed by linking problems to the mechanical and automotive engineering expertise program. This is done so students are aware of the need to learn mathematics, especially SPLDV material. This learning design has been developed through a research development involving 42 students from SMK 1 Padang. Data was collected through observation, interviews, field notes and analysis of test results. The results of this study indicate that the SPLDV learning design linking problems to the mechanical engineering expertise program can help students develop their problem mathematics skills. Through this research it is also known that this learning design has also been able to increase the interest of vocational school students towards mathematics.

Keywords
learning design, mathematics communication, two-variable linear equation systems, vocational high school

Topic
Mathematics Education

Link: https://ifory.id/abstract/b6tCVGTUanFz

Corresponding Author
ELIS MUSLIMAH NURAIDA

Institutions
a) Master Of Mathematics Education, Sriwijaya University, Jalan Srijaya Negara, Bukit Besar, Ilir Barat I, Bukit Lama, I, Kota Palembang, 30128, Indonesia.

ratu.ilma[at]yahoo.com

b) Master Of Mathematics Education, Sriwijaya University, Jalan Srijaya Negara, Bukit Besar, Ilir Barat I, Bukit Lama, I, Kota Palembang, 30128, Indonesia.

Abstract
One of the alternatives used in improving the quality of education and the quality of learning is by using the lesson study system which is currently being discussed in Indonesia. Lesson Study it self is a learning system that has long been applied in Japan. The purpose of this study is to know how Lesson Study is to remind professional teachers in the discussion of mathematics learning of material integer multiplication. This research is related to the 2013 learning curriculum and PMRI approach. The methodology used in this study is deskriptive. This research involved all mathematics teachers of class VII Palembang 1 Junior High School. The activities in this study consist of four stages: Plan, Do, See and Re-design. The first stage is designing learning devices such as Lesson plan, teacher instructions, and student worksheets. Second stage applies the results of previous stage. Third, reflects the results of the second stage, then the Re-Design stage changes or Improves the learning instrument. The media used in this study are, Syllabus, teacher and student handbook, Lesson plan, Student worksheets and video. The results of this study indicate that the lesson study system can remind professional teachers in designing mathematics learning of material integer multiplication.

Keywords
PMR, lesson study,Mathematics Learning Process,Student worksheets

Topic
Mathematics Education

Link: https://ifory.id/abstract/CQe8GJrpEf2M

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
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
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 purpose of this study is to analyze the learning obstacle that student commit in 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 commit in basic trigonometric equations. Data was collected through a test that was tested to 11th grade students who had learned basic trigonometric equations. The result showed that the learning obstacle that student commit in basic trigonometric equations have been categorized into 3 (three) types, that is learning obstacle of concept image, learning obstacle that related to various information and learning obstacle in mathematical representation.

Keywords
Learning obstacle; Trigonometric Equations

Topic
Mathematics Education

Link: https://ifory.id/abstract/LhQnX6Jdv8gy

Corresponding Author
Inne Marthyane Pratiwi

Institutions
Universitas Islam Negeri Sunan Gunung Djati Bandung

Abstract
Mathematical communication skill are very important for the students of Madrasah Ibtidaiyah. Students who have good mathematical communication skill are able to express and accept mathematical ideas carefully, analytically, critically and evaluatively so they will understand mathematical concepts. This study aims to identify the learning obstacles faced by students in mathematical communication skill in the volume of cubes and beams subject. This research was part of the Didactical Design Research (DDR) conducted at one of the Madrasah Ibtidaiyah in Bandung Regency. Research participants were 13 of sixth grade students. Data collection is done by test, interview, and observation. Based on the research, we found difficulties faced by students in mathematical communication skill on volume of cubes and beams subject which are categorized into ontological, didactical, and epistemological obstacle. For this reason, further research is needed in the form of learning design to overcome the learning obstacle.

Keywords
earning obstacle, madrasah ibtidaiyah, mathematical communication skill, volume of cubes and beam

Topic
Mathematics Education

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

Corresponding Author
Wulansary Kartika Hayati Wahyono Putri

Institutions
Program Studi Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia

*wulansary.k[at]student.upi.edu

Abstract
This research was implemented to students from the 4th grade and 7th grade in one of elementary and junior high schools around Bandung city. The initial problem that became a background of this research was the difference ability and learning experience of elementary and junior high school students when learning the area of triangle concept. So that the learning carried out should also be different according to the needs of students. The focus on this research was to develop the Hyphotetical Learning Trajectory (HLT) that is appropriate for the needs of elementary and junior high school students based on the results of teacher and students interview and learning observation. This research used the qualitative method in the form of a didactical design research through three phases of analysis that are prospective analysis, metapedadidactic analysis, and retrospective analysis, with the triangulation technique for collecting data. Based on the results and discussion of research, the learning trajectory for elementary students is concluding the triangle area formula based on concrete activities, while for junior high school students is proving the formula of the triangle area and applying it in more complex problems.

Keywords
Learning situation; the area of triangle; learning trajectory; elementary school; junior high school

Topic
Mathematics Education

Link: https://ifory.id/abstract/XQwA4YzWVFBx