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Desimal: Jurnal Matematika
Published by Universitas Islam Negeri Raden Intan Lampung
ISSN : 26139073     EISSN : 26139081     DOI : -
Core Subject : Education, Social,
Education Mathematics Social Sciences
Desimal: Jurnal Matematika, particularly focuses on the main issues in the development of the sciences of mathematics education, mathematics education, and applied mathematics. Desimal: Jurnal Matematika published three times a year, the period from January to April, May to Augustus, and September to December. This publication is available online via open access.
Arjuna Subject : -
Articles 310 Documents
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Integer linear programming application in production results optimization using cutting plane method Firmansah, Fery; Wulandari, Fitriana
Desimal: Jurnal Matematika Vol. 4 No. 1 (2021): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v4i1.7975

Abstract

Integer Linear Programming is a special form of linear programming which the decision variables are in integer form. Berkah Rasa is a home industry business in the form of Jenang Ayu and Jenang Krasikan processed food.  The daily production that carried out by Berkah Rasa is based on the availability of raw materials and the number of requests. So far, Berkah Rasa has not had the right strategy in producing Jenang to get maximum profit. The purpose of this research is to apply integer linear programming to the optimization of Jenang Ayu and Jenang Krasikan production. The method used to solve this problem is the cutting plane method. The results of the research obtained is the optimal solution for Berkah Rasa, that is by producing 25 kg of Jenang Ayu and 22 kg of Jenang Krasikan every day. So that the benefits obtained by Berkah Rasa every day are IDR 727,000.00.
The development of student worksheets using ethnomatematics based prediction, observation, and explanation learning models to improve student's critical thinking ability Mania, Sitti; Jamaluddin, Nazurah; Kusumayanti, Andi; Nur, Fitriani
Desimal: Jurnal Matematika Vol. 4 No. 2 (2021): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v4i2.8306

Abstract

This research is a research and development that aims to develop and assess the quality of student worksheets (LKPD) using ethnomathematics-based prediction, observation, and explanation (POE) learning models to improve students' mathematical critical thinking abilities that are valid, practical, and effective. This research is a development research that refers to the ADDIE development model, namely, analysis, design, development, implementation, and evaluation. In this research, the test subjects were students of class VIII G MTs Al-Urwatul Wutsqaa Sidrap Regency with 26 students. Based on the results of the trials that have been carried out, it is found that (a) The validation of LKPD and other instruments are 3.78 in the "very valid" category, (b) Practical based on the average percentage for the implementation of LKPD has 1.93 of average with the implemented category. Overall, the percentage of the average student response is 93.75% with a very positive category, and the average teacher response is 100% with a very positive category. Thus, the developed LKPD meets practical criteria. (c) Effective because the average percentage of students’ activity is 84.13% with the very good category, the average ability to manage learning is 4.1 in the good category. The average percentage of student learning outcomes tests on critical thinking abilities is 78.6.  Therefore, it could be said that students' critical thinking abilities used LKPD is good. It can be concluded that the trial phase which was carried out using the ethnomathematics-based student worksheet of POE learning models to improve students' critical mathematical abilities had met the criteria of validity, practicality and effectiveness.
Students' mathematical communication skills by applying the round club type of cooperative learning model in terms of linguistic intelligence Mulia, Dira Utami; Masykur, Ruhban; Widyastuti, Rany
Desimal: Jurnal Matematika Vol. 4 No. 1 (2021): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v4i1.8514

Abstract

The purpose of this research is to determine the effect of the Round Club Type of Cooperative Learning model on mathematical communication skills in terms of linguistic intelligence. This research is a type of Quasy Experimental Design research with a  factorial research design. The population in this research were all 7th grade students of SMP Karya Bhakti Panaragan Tulang Bawang Barat. The sampling technique used is the Cluster Random Sampling technique with The Operation of Algebraic Form material. The sample consisted of two classes, namely the experimental class and the control class. Techniques in data collection used were mathematical communication skills tests and student linguistic intelligence questionnaires. The analytical technique used in this research is a two-way analysis of variance with unequal cells. Based on theoretical studies and calculations, it can be concluded that: there is an effect on students who use the Round Club type of cooperative learning model on mathematical communication skills, there is an influence of linguistic intelligence on mathematical communication skills, and there is no interaction between the Round Club type of Cooperative learning model and linguistic intelligence on mathematical communication skills.
The development of website-based electronic teaching materials on central tendency materials to support online learning Putri, Yasna Kartika; Lestyanto, Latifah Mustofa
Desimal: Jurnal Matematika Vol. 4 No. 2 (2021): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v4i2.8787

Abstract

During the implementation of online learning caused by the Covid-19 pandemic, there are some obstacles that occurred in the class. Almost 40% of students in observation class felt bored and spent more time doing assignments during online learning.  Hence, to stimulate the activeness of students it is needed to develop website-based electronic teaching materials on central tendency material which has valid, practice, and effective criteria and can support online learning. The development model used is the 3-stage Plomp Model, namely (1) preliminary research, (2) development or prototyping phase, (3) assessment phase. The subjects of this study are 30 students in the 8H class of Junior High School 8 Malang. The results of the validation test show that the product is valid based on the validation sheet by an expert validator and a practitioner validator which get an average score of 3.9. The results of the practicality test show that the product is practically based on the teacher's and the student's response questionnaire sheets which get an average score of 3.67. Besides, about 79% of students agreed that the product is interesting. The effectiveness test shows that the product is effective since 86.7% of students met the minimum KKM score in the evaluation test. So, it could be concluded that the product  developed can be used to support online learning.
Implementation of wahdah method on the mathematics learning Lutfi, Sunisa; Sunanto, Rahma Faelasofi; Nihayati, Nihayati
Desimal: Jurnal Matematika Vol. 4 No. 2 (2021): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v4i2.8868

Abstract

The problem in this research is the low student learning outcomes that are thought to be due to the use of teaching methods, where teachers still dominate the teaching and learning process. Sampling was done by using the cluster random sampling technique. The research instrument used was a test consisting of 5 items in the form of a description. The data analysis technique used the t-test because the population research data were normally distributed and homogeneous. The difference in the average of mathematics learning outcomes of students between the experimental class and the control class is shown by the results and the average of mathematics learning outcomes of students in the experimental class is 77.93 higher than the average mathematics learning outcomes of students in the control class 55.72 which means that there is the influence of the Wahdah method on mathematics learning outcomes of 22.21.
The comparison of the effectiveness of the lowest supply lowest cost (LSLC) algorithm and the exponential approach algorithm in transportation problems Purba, Tresya Carmela; Notiragayu, Notiragayu; Fitriani, Fitriani; Azis, Dorrah
Desimal: Jurnal Matematika Vol. 4 No. 2 (2021): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v4i2.9179

Abstract

Transportation problems are one of the particular forms that often appear in linear programs, one of which is the distribution of goods. A transportation method is needed to determine the optimal result, namely, the minimum cost from source to destination with all demand and supply fulfilled. There are several methods, one of which is the Lowest Supply Lowest Cost Method (LSLC) and the Exponential Approach Method (PE). Both methods are made in a MATLAB program, generating a script that calculates the algorithm's time complexity. Using the function notation, the Big-O Algorithm complexity of the Lowest Supply Lowest Cost method is more efficient than the Exponential Approach Method algorithm. At the same time, the optimal result for the minimum cost between the two methods is obtained by using the Exponential Approach Method.
Analysis of metacognition skills with students' generalization abilities Yani, Nur Fitri; Hendriana, Benny
Desimal: Jurnal Matematika Vol. 4 No. 2 (2021): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v4i2.9249

Abstract

This research was conducted with the aim of describing metacognitive skills with students' mathematical generalization abilities in problem solving. This type of research is a qualitative descriptive research. This research was conducted on 9th grade students by taking 5 students as research subjects. Data collection techniques used in this research were tests, interviews, and questionnaires. The results of this research indicate that students are able to apply the designs that they will use to solve problems. Even though the evaluation indicators only review the results obtained.
Mathematics learning independence: The relationship of youtube as a media for mathematics learning Isnaini, Jihan Fitri; Azhar, Ervin
Desimal: Jurnal Matematika Vol. 4 No. 2 (2021): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v4i2.9373

Abstract

This research aims to determine whether there is a relationship between YouTube social media and student learning independence. This research was conducted through a quantitative approach using ex-post facto research methods. The sampling technique used was cluster random sampling. The validity of the instrument was tested using expert judgment and empirical test using Product Moment/Pearson. The instrument was tested using the Cronbach Alpha formula. The data obtained were analyzed using descriptive statistics, prerequisite test analysis, and correlation analysis. Based on theoretical studies and calculations of the two variables, it shows that there is a positive relationship between YouTube social media on student learning independence and the magnitude of the YouTube social media relationship on student learning independence.
Analysis of the mathematical reflective thinking ability of MTs students in terms of self-regulated learning during the COVID-19 pandemic Kamalia, Millah; Nuriadin, Ishaq
Desimal: Jurnal Matematika Vol. 4 No. 2 (2021): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v4i2.9375

Abstract

This research aims to analyze and describe students' mathematical reflective thinking abilities during online learning in terms of self-regulated learning during the COVID-19 pandemic. The method used is qualitative descriptive. The purposive sampling technique was used to select 3 samples consisting of 1 subject having high self-regulated learning, 1 subject having moderate self-regulated learning, and 1 subject having low self-regulated learning. The instrument in this research used a mathematical reflective thinking ability test and self-regulated learning questionnaires. Data analysis in this research uses the Miles and Huberman model, namely data reduction and categorization, data presentation, drawing conclusion, or verification. The triangulation technique is carried out by comparing the results of the mathematical reflective thinking test with interviews to verify the validity of the data. The conclusion of this research is that subject who have high self-regulated learning  is quite reflective, the subject who have moderate self-regulated learning is quite reflective, and the subject who have low self-regulated learning is less reflective.
The determination of the aggregate loss distribution through the numerical inverse of the characteristic function using the trapezoidal quadrature rule Mutaqin, Aceng Komarudin; Sa'diah, Khalimatus
Desimal: Jurnal Matematika Vol. 4 No. 3 (2021): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v4i3.9434

Abstract

Aggregate loss is the total loss suffered by an insured in a certain period. The aggregate loss depends on the claim frequency and the amount of the claim each time the insured makes a claim. The distribution of aggregate losses must be known to calculate motor vehicle insurance premiums. In general, there are two methods that can be used in determining the distribution of aggregate losses, namely exact and numerical. When an exact solution is difficult to find, numerical methods such as Monte Carlo, Panjer Recursion, and Fast Fourier Transform can be used. This research will discuss the determination of the distribution of aggregate losses through the numerical inverse of the characteristic function using the trapezoidal quadrature rule, on the data of motor vehicle insurance category 7 in Indonesia. The estimated cumulative distribution function for the largest aggregate loss is 0.999993. When x=0, it means that if someone does not file a claim, the estimated value of the cumulative distribution function is 0.9293. This value is close to the percentage of the number of insured, which is 0.9241.

Page 13 of 31 | Total Record : 310

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