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Algoritma: Jurnal Matematika, Ilmu Pengetahuan Alam, Kebumian dan Angkasa
Published by Asosiasi Riset Ilmu Matematika dan Sains Indonesia
ISSN : 30326230     EISSN : 30465427     DOI : 10.62383
Core Subject : Science, Education,
Earth & Planetary Sciences Mathematics
Bidang kajian dalam jurnal ini termasuk sub rumpun Ilmu Matematika, Ilmu Pengetahuan Alam, Kebumian dan Angkasa. Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa
Arjuna Subject : Matematika - Matematika (Lain-Lain)
Articles 174 Documents
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Analisis Kesulitan Siswa Kelas 1 SDN 1 Pedawang dalam Memahami Soal Cerita Matematika Akibat Rendahnya Kemampuan Literasi dan Numerasi Firdausi Zula, Yukhanit; Aryani, Dias Syifa; Riswari, Lovika Ardana
Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa Vol. 3 No. 4 (2025): Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa
Publisher : Asosiasi Riset Ilmu Matematika dan Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62383/algoritma.v3i4.645

Abstract

Mathematics learning in Elementary School is very important to form logical, systematic, and critical thinking skills. Mathematics learning is closely related to numeracy literacy. At the elementary school level, especially grade 1, literacy and numeracy problems are increasingly visible when students are faced with mathematical story problems. In grade 1 of SDN 1 Pedawang, the results of daily tests and end-of-semester tests show that students' ability to solve story problems is still low. This study aims to analyze the difficulties of grade 1 students at SDN 1 Pedawang in understanding mathematical story problems due to low literacy and numeracy skills. This study uses a qualitative descriptive research type. The population of grade 1 students at SDN 1 Pedawang is 14 students, consisting of 9 female students and 5 male students. The subjects used were 2 students to be analyzed using purposive sampling techniques because they showed striking difficulties in understanding story problems based on observation results and low test scores. Data collection techniques through observation, interviews, and documentation. Data analysis techniques using the Miles and Huberman model which includes data reduction, data presentation, and drawing conclusions. The results of the study showed that students had difficulty in understanding mathematical story problems on five indicators according to Newman's theory, namely reading, understanding, transformation, process skills, and writing answers. The conclusion of this study shows that low literacy and numeracy of students are the main factors in the difficulty of understanding mathematical story problems.
Inovasi Video Pembelajaran Matematika Berbasis YouTube: Solusi Interaktif untuk Materi Konsep Aljabar Siswa Kelas VII Rizaldi Khairun Nuzul; Anita Khumairoh; Faridah Hamidah Iswahyudi; Diva Putri Vania; Tri Fajar Yuliarti; Eka Septiani
Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa Vol. 3 No. 4 (2025): Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa
Publisher : Asosiasi Riset Ilmu Matematika dan Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62383/algoritma.v3i4.648

Abstract

Mathematics is often perceived as a subject that is difficult for students to master, a notion that has been confirmed by numerous previous studies. One of the contributing factors is the limited variety of instructional media used in classrooms, which affects students' interest and comprehension. Many teachers still lack appropriate learning media to support blended learning approaches. This study aims to develop and implement multimedia-based Educational Instructional Media (EIM) that are valid, practical, and effective. The project utilizes video-based learning to deliver algebra concepts material for Grade VII students at SMPN 252 Jakarta and SMPIT Al-Qudwah. The development process follows the ADDIE model, which includes five stages: analysis, design, development, implementation, and evaluation. During the analysis phase, both learning needs and content requirements were mapped according to SAP (System Analysis and Product). The material was then divided into seven core sections. In the design stage, the curriculum structure, system flow, and user interface were developed. The development stage involved creating instructional content based on the analysis results. The content was then uploaded to the Moodle platform and presented using the Project-Based Learning (PjBL) model.
Model Stokastik Teori Antrean Non Poisson: Studi Kasus: Analisis Model Antrean Non-Poisson pada Pelayanan Mie Gacoan Jimbaran Permata Sari, K. Ayu Diah; Fortuna Dewi, Ni Kadek; Dwi Octavanny, Made Ayu
Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa Vol. 3 No. 4 (2025): Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa
Publisher : Asosiasi Riset Ilmu Matematika dan Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62383/algoritma.v3i4.662

Abstract

At Mie Gacoan Jimbaran, there are two payment service units operating under a single queue line, which often leads to customer congestion during peak hours. This study aims to evaluate the most appropriate non-Poisson queueing model, assess the performance of the existing queueing system, and determine the optimal number of cashiers (servers) to enhance service efficiency at Mie Gacoan Jimbaran.The observation was conducted at Mie Gacoan Jimbaran, located in Badung, Bali, on Saturday, November 18, 2023, over a period of one hour and fifteen minutes. Based on the results of the queueing model analysis and system performance evaluation, the customer arrival rate was found to be two persons per minute, with a service rate of three persons per minute. Furthermore, the average number of customers in the system and in the queue was two individuals, respectively. The probability of the cashiers being idle was recorded at 71.28%, with an average customer waiting time of 0.7696 minutes in the queue and 1.1829 minutes within the entire system.
Isolasi dan Pengamatan Pertumbuhan Bakteri pada Kulit Kayu Manis (Cinnamomum Burmannii) Asal Kerinci Maura Maharani; Ardi Mustakim
Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa Vol. 3 No. 4 (2025): Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa
Publisher : Asosiasi Riset Ilmu Matematika dan Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62383/algoritma.v3i4.676

Abstract

Cinnamon bark (Cinnamomum burmannii) is known to contain antibacterial active compounds such as cinnamaldehyde and eugenol. However, as a natural material collected from open environments, it can become a habitat for various microorganisms, including bacteria. This study aimed to isolate and observe bacterial growth found on cinnamon bark originating from Kerinci. Samples were collected from a local market and processed using serial dilution, then cultured on Nutrient Agar (NA) and incubated for 24–48 hours at room temperature. The results revealed the growth of bacterial colonies with diverse morphological characteristics, such as round shape, smooth edges, and cream to cloudy white colors. Gram staining indicated the presence of both Gram-positive and Gram-negative bacteria. Preliminary biochemical tests showed both catalase-positive and catalase-negative isolates. These findings suggest that despite the antibacterial properties of cinnamon bark, certain microorganisms are capable of surviving. The detected bacteria are likely to be either endophytic or environmental contaminants that have adapted. These results provide an initial insight into the local microbial diversity and open opportunities for further exploration of bacteria with biotechnological potential, while also supporting post-harvest quality control of spice products.
Strategi Pembelajaran IPA Berbasis Konkret untuk Mengatasi Kesulitan Berpikir Abstrak pada Siswa SD dalam Memahami Konsep Ilmiah Ika putra viratama; Andrea Gafiria Permata Putri; Miske Aprillia Herawati; Nur Ihwanul Karim; Diva Amilia Ramadhani
Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa Vol. 3 No. 4 (2025): Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa
Publisher : Asosiasi Riset Ilmu Matematika dan Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62383/algoritma.v3i4.680

Abstract

This study aims to quantitatively test the effectiveness of a concrete object-based science learning strategy in improving students' understanding of abstract concepts and addressing their learning difficulties in science at the elementary school level. By implementing a quasi-experimental design, this study compared a group of students who learned science through real media and concrete objects and through contextual, hands-on experiences with a control group. The hypothesis in this study states that students in the experimental group will show a significant increase in their science concept understanding test scores, measurable development of critical thinking skills, and a decrease in their detected learning difficulties, when compared with the control group. The tools employed in this research included a standardized test for understanding science concepts, a rubric designed to evaluate critical thinking abilities, and a Likert-scale survey to gauge students' opinions on how difficult they found the material. The quantitative data collected will be examined using an independent t-test to compare the average scores of different groups and a paired t-test to measure progress within the experimental group. Preliminary findings indicate that complex and abstract science materials are often the main cause of learning difficulties for elementary school students, which is in line with the limitations in abstract reasoning at that age, as stated in Piaget's theory of cognitive development. Therefore, this concrete method is expected to significantly increase student participation, help them absorb new information into their existing understanding, and in turn, improve their learning outcomes. The results of this study will provide concrete evidence of the positive effects of using concrete media and direct experiences in science learning at the elementary school level, as well as provide data-based suggestions for curriculum development and better teaching practices to address gaps in students' understanding of abstract concepts.
Analisis Data Antrean Non-Poisson : Studi Kasus: Konsumen Toko Ritel Indomaret Jimbaran Ni Putu Linda Maharani; Ni Putu Meyla Aryani; Anak Agung Ngurah Bagus Surya Ananta Jelai; Made Ayu Dwi Octavanny
Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa Vol. 3 No. 5 (2025): Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa
Publisher : Asosiasi Riset Ilmu Matematika dan Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62383/algoritma.v3i5.679

Abstract

Queues are a common phenomenon and are often encountered in various aspects of daily life, especially in places that provide public services. One of the places that is inseparable from the queue problem is Indomaret Jimbaran, Bali. The large number of buyers who send data to Indomaret Jimbaran during peak hours causes the queue rate to be high. This is due to the limited number of service facilities and the time provided to serve each visitor is limited so that the cashier cannot serve buyers optimally. Therefore, the researcher is interested in researching whether the service facilities provided by Indomaret Jimbaran are effective and efficient so that they can satisfy customers.Using the Kolmogorov-Smirnov test, it was found that the appropriate distribution for the interarrival time of customers is the Gamma distribution, while the service time follows the 3-parameter Weibull distribution. The queueing model used is . The results show that having three cashiers is sufficient to handle the level of customer traffic at Indomaret Jimbaran retail store.
Pengamatan Pertumbuhan Jamur Rhizopus oligosporus dari Tempe pada Media PDA Menggunakan Metode Pengenceran Lisa Fitriana; Ardi Mustakim
Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa Vol. 3 No. 4 (2025): Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa
Publisher : Asosiasi Riset Ilmu Matematika dan Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62383/algoritma.v3i4.687

Abstract

Tempe is a fermented soybean product widely known in Indonesia and various countries, with Rhizopus oligosporus fungus as the main microorganism involved in the fermentation process. This study aims to observe the growth of Rhizopus oligosporus fungus isolated from tempeh using the dilution method and grown on Potato Dextrose Agar (PDA) media. The research process began with taking tempeh samples which were then subjected to serial dilutions. Next, the diluted samples were inoculated into PDA media and incubated at 37°C to facilitate fungal growth. Observations were made periodically to monitor the development of fungal colonies and the morphology formed. In the observation, it was found that Rhizopus oligosporus fungal colonies growing on PDA media were grayish-white with a distinctive filamentous hyphal structure. This indicates that PDA media strongly supports the growth of the fungus. In addition, the dilution method used in this study proved effective in separating fungal colonies, thus facilitating the morphological identification of each colony. The serial dilution method is very important in isolating microorganisms present in tempeh samples. By separating the fungal colonies from each other, researchers can observe the development of each colony more clearly and accurately. The results of this study indicate that PDA media is very suitable for supporting the growth of Rhizopus oligosporus and that the serial dilution method is an effective way to isolate this fungus from tempeh. In conclusion, this study proves that serial dilution followed by inoculation on PDA media is an effective method in observing and isolating Rhizopus oligosporus from tempeh. PDA media is able to support optimal fungal growth and allows for clear observation of the colonies and their morphology.
Metode Penelitian Ilmiah Isolasi dan Identifikasi Bakteri Asam Laktat dari Tempoyak Tradisional Asal Jambi Intan Hapsari; Ardi Mustakim
Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa Vol. 3 No. 4 (2025): Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa
Publisher : Asosiasi Riset Ilmu Matematika dan Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62383/algoritma.v3i4.688

Abstract

Durian is a tropical fruit belonging to the climacteric group, meaning it experiences a surge in respiration after harvest and quickly deteriorates. Due to its perishable nature, processing is necessary to extend its shelf life and maintain its nutritional value and flavor. One traditional method of processing that has long been known in Indonesia, particularly in Kalimantan and Sumatra, is the fermentation of durian flesh into tempoyak. Tempoyak is a natural fermentation product made from ripe durian flesh that has undergone a further ripening process and has a distinctive sour taste and strong aroma. The tempoyak fermentation process involves the activity of microorganisms, particularly lactic acid bacteria (LAB) such as Lactobacillus plantarum and Lactobacillus curvatus, which play a crucial role in producing flavor, a semi-solid texture, and functional health benefits. Human food needs depend not only on the quantity of food but also on the quality of its nutritional content, such as carbohydrates, protein, fat, vitamins, and minerals. In this context, fermented foods such as tempoyak provide added value in the form of probiotics that have the potential to improve digestive health. Lactic acid bacteria, which dominate the natural fermentation process, play a crucial role in the formation of flavor compounds and beneficial biological activities. This study aimed to isolate and identify the types of LAB present in traditional tempoyak from Jambi. Isolation was conducted to obtain pure strains of bacteria with potential probiotics, while identification aimed to determine the dominant bacterial species in the tempoyak fermentation process. The results of this study are expected to contribute to the development of functional food products based on local fermentation.
Optimisasi Pengendalian Persedian Alat Tulis Kantor Menggunakan Metode Min-Max Stock pada BPKP Provinsi Sumatera Utara Aisyah, Siti; Aprianingsih, Melinda; Mutiara, Tia; Filia Sari, Rina; Syuhada Syuhada
Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa Vol. 3 No. 4 (2025): Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa
Publisher : Asosiasi Riset Ilmu Matematika dan Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62383/algoritma.v3i4.691

Abstract

The use of office stationery (ATK) plays an important role in supporting the smooth operation and administrative activities of government agencies, particularly the Financial and Development Supervisory Agency (BPKP). As an institution whose primary function is to supervise and evaluate state financial management, BPKP requires adequate logistical support to ensure optimal implementation of its duties. One form of such support is the availability of sufficient, timely, and appropriate ATK. Common problems often encountered in ATK management are overstock, which is excess inventory that leads to wasted budget and storage space, and stockout, which is a shortage of inventory that can hinder work activities. This study aims to control ATK inventory by applying the Min-Max Stock method. This method helps in determining the minimum and maximum inventory limits for each type of ATK, so that procurement of goods can be carried out in a planned and efficient manner. With this approach, agencies can maintain a balance between availability of goods and efficient use of the budget. The results of the study indicate that the application of the Min-Max Stock method in the BPKP environment produces more rational inventory figures. For the type of HVS paper F4 size ATK, the minimum and maximum values are set at 12 reams. Meanwhile, for A4-sized HVS paper, the minimum and maximum values are 72 reams and 98 reams, respectively. For printer ink, the ideal minimum and maximum quantities are 74 and 92 bottles. Meanwhile, BPKP logo folders have a minimum value of 240 sheets and a maximum of 325 sheets. The implementation of this method has a positive impact on the efficiency of the procurement and control process of stationery at BPKP.
Optimisasi Pengendalian Persedian Alat Tulis Kantor Menggunakan Metode Min-Max Stock pada BPKP Provinsi Sumatera Utara Siti Aisyah; Melinda Aprianingsih; Tia Mutiara; Rina Filia Sari; Syuhada Syuhada
Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa Vol. 3 No. 5 (2025): Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa
Publisher : Asosiasi Riset Ilmu Matematika dan Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62383/algoritma.v3i5.692

Abstract

The use of office stationery (ATK) plays a crucial role in supporting the smooth running of administrative activities within government agencies, particularly within the Financial and Development Supervisory Agency (BPKP). As an agency responsible for supervising and evaluating state financial management, the availability of adequate and timely ATK is a crucial supporting factor in ensuring the efficient and effective operation of BPKP. Unavailability of ATK can hamper administrative processes, while excess stock can lead to budget waste and inefficiency in logistics management. This study aims to implement an inventory control system for ATK use at BPKP using the Min-Max Stock method. This method is used to determine the ideal minimum and maximum limits for ATK inventory, with the aim of minimizing overstock and stockouts. With this approach, agencies can manage ATK procurement more efficiently based on actual needs and existing usage patterns. The results of the study indicate that the application of the Min-Max Stock method provides significant results in inventory management. For the type of ATK in the form of F4 size HVS paper, the minimum and maximum values are set at 12 reams. Meanwhile, for A4-sized HVS paper, the minimum quantity is 72 reams and the maximum is 98 reams. For other types of stationery, such as printer ink, the minimum and maximum quantities are set at 74 and 92 bottles, respectively. For BPKP logo folders, the recommended minimum is 240 sheets and the maximum is 325 sheets. By implementing this method, BPKP can optimally manage stationery inventory, thereby minimizing the risk of stockouts that could disrupt operations and preventing inefficient stockpiling. This approach contributes to more orderly, transparent, and cost-effective logistics governance within the government.

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