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PENERAPAN MODEL PBL BERBASIS STEM UNTUK MENINGKATKAN KEMAMPUAN REPRESENTASI MATEMATIS SISWA PADA MATERI REFLEKSI DALAM TRANSFORMASI GEOMETRI DI SMP NEGERI 29 MEDAN Agnes Venita Gultom; Amanda Nurhayati Siagian; Chintia Utami; Eka Novayanti Manalu; Hutabarat, Florentina; Maysaroh Pos Pos; Melisa Yessi Sagala; Rahel Valentina Br Tarigan
Pendas : Jurnal Ilmiah Pendidikan Dasar Vol. 11 No. 02 (2026): Volume 11 No. 02, Juni 2026 Produce
Publisher : Program Studi Pendidikan Guru Sekolah Dasar FKIP Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/jp.v11i02.50576

Abstract

This study aims to determine the improvement of students’ mathematical representation abilities through the implementation of the STEM-based Problem Based Learning (PBL) model on reflection material at SMP Negeri 29 Medan. This study used a quantitative approach with a one group pretest-posttest design. The research subjects were ninth-grade students of SMP Negeri 29 Medan. The research instruments consisted of a mathematical representation ability test and student activity observation sheets. Data were collected through pretest, posttest, and observations. The data were analyzed using mean scores, N-Gain, and percentage of student activities. The results showed an improvement in students’ mathematical representation abilities after the implementation of the STEM-based PBL model. The average pretest score of 20.05 increased to 79.58 in the posttest, with an N-Gain score of 0.75 categorized as high. Student activities during the learning process were in the good to very good category. The use of the Autograph application helped students understand the concept of reflection more concretely and improved their visual and symbolic representation abilities. Based on the findings, the STEM-based PBL model was effective in improving students’ mathematical representation abilities on reflection material.
ANALISIS KEMAMPUAN SISWA DALAM MENYELESAIKAN SOAL TKA MATEMATIKA TINGKAT SMA DI SMAS PRIMA TEMBUNG Agnes Venita Gultom; Manalu, Eka Novayanti; Elsa Noviyanti Br Sinaga; Maysaroh Pos Pos; Melisa Yessi Sagala
Pendas : Jurnal Ilmiah Pendidikan Dasar Vol. 11 No. 02 (2026): Volume 11 Nomor 02, Juni 2026 Public
Publisher : Program Studi Pendidikan Guru Sekolah Dasar FKIP Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/jp.v11i02.50912

Abstract

This study aims to analyze students’ ability to solve high school-level mathematics Academic Ability Test (TKA) questions at SMAS Prima Tembung. The study employed a qualitative descriptive method with a sample of 28 twelfth-grade students. Data collection was conducted by administering a mathematics TKA test consisting of 25 questions categorized into LOTS (Lower Order Thinking Skills), MOTS (Middle Order Thinking Skills), and HOTS (Higher Order Thinking Skills). The results indicated that the students’ average score was 69.42, placing them in the moderate category. Most students were able to solve LOTS questions well, but still experienced difficulties in solving MOTS and HOTS questions, which require analytical, reasoning, and problem-solving skills. The highest error rates were found in the topics of linear programming, geometric transformations, trigonometric function graphs, compound interest, the law of cosines, and circle equations. Students’ difficulties stemmed from a lack of conceptual understanding, carelessness in calculations, difficulty determining solution strategies, and low reasoning skills in solving contextual problems. Therefore, more innovative learning strategies and continuous HOTS-based practice are needed to improve students’ mathematical thinking skills.
Co-Authors Agnes Venita Gultom Amanda Nurhayati Siagian Chintia Utami Eka Novayanti Manalu Elsa Noviyanti Br Sinaga Hutabarat, Florentina Manalu, Eka Novayanti Melisa Yessi Sagala Rahel Valentina Br Tarigan