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All Journal Edumatsains Jurnal Dinamika Pendidikan
Santri Chintia Purba
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Agriculture, Biological Sciences & Forestry Chemistry Education Mathematics Physics

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Journal : Edumatsains

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PENERAPAN MODEL PEMBELAJARAN STUDENT TEAM ACHIEVEMENT DIVISION UNTUK MENINGKATKAN KEMAMPUAN MATEMATIS Putri Saron Mallini; Santri Chintia Purba; Hotmaulina Sihotang
EduMatSains : Jurnal Pendidikan, Matematika dan Sains Vol. 8 No. 1 (2023): Juli
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Kristen Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33541/edumatsains.v8i1.5094

Abstract

Mathematics learning is designed to achieve the objective of mathematics learning, that is to stimulate students to grow their mathematical abilities. However, the activities of teaching-learning have been applying the conventional learning method, in which the teacher has full control of learning so that students' mathematical abilities are classified as low. The learning model that is applied to the solution to improve students' mathematical abilities is Student Team Achievement Division (STAD). This research involved VIII classes of SMP Negeri 50 Jakarta, which are VIII-B and VIII-D classes using a Quasi-Experimental Design. Data collection was based on a pretest, posttest, and gain data by statistical test through the Mann-Whitney U test by the calculation of the program SPSS 26 because the data is not a normal distribution and not homogeneous so that it is obtained that: (1) There is a difference in mathematical ability between students who apply STAD and Expository learning models. The average posttest score of mathematical ability between students with the STAD learning model treatment is superior to the Expository learning model, that is 66,64 and 15,78. (2) There is a difference in improving mathematical ability between students who apply the STAD and Expository learning models. The average gain score of mathematical ability between students who apply the STAD learning model is superior to the Expository learning model, that is 64,56 and 13,08.
Determining the Ideal Nutritional Composition for Stunting Management Using the LU Decomposition Method Santri Chintia Purba; Ningsi, Hildegardis; Putri Artha
EduMatSains : Jurnal Pendidikan, Matematika dan Sains Vol 10 No 4 (2026): April
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Kristen Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33541/edumatsains.v10i4.7789

Abstract

Stunting remains a critical nutritional issue in Indonesia, particularly among children aged 1–3 years, where adequate macronutrient intake is essential for optimal growth and development. This study aims to model nutritional requirements using a system of linear equations and solve it through the LU decomposition method. The model is constructed based on the Recommended Dietary Allowance (RDA/AKG) and the Indonesian Food Composition Table (TKPI), using three variables representing the consumption of chicken eggs, white rice, and soybeans, and three equations representing protein, fat, and carbohydrate requirements. The system is formulated as a 3×3 linear model and solved using LU decomposition through matrix factorization and forward–backward substitution. The results show a unique solution, with values . Although mathematically valid, the negative value indicates that the model does not fully represent real-world conditions due to the absence of constraints, particularly non-negativity conditions. These findings confirm that LU decomposition is effective for solving linear systems, but its practical application requires integration with constraint-based approaches to ensure feasible and realistic solutions.
Co-Authors HOTMAULINA SIHOTANG Ningsi, Hildegardis Putri Artha Putri Saron Mallini