Double Discount at Pempek Stall: Learning Trajectory using New Math Pempek Menu List Contexts

Abstrak

Inggris

A common mistake students make in understanding the concept of discounting, especially double discounting, is to directly add two percentages without considering the order of application and the change in the basis of subtraction after the first discount. Therefore, learning is needed that can help students overcome these problems. This study aims to develop a learning pathway to understand the concept of discounting through the context of the New Math Pempek menu list by utilizing the Indonesian Realistic Mathematics Education approach. The method used is a design research type validation study consisting of: preliminary design, design experiment, and retrospective analysis. The research subjects were 35 students of MTs. Data were collected through video recordings of the learning process, student worksheets, observation notes of student discussions, and interviews, then analyzed retrospectively. The results showed that the learning trajectory began with students understanding information from the menu, acting as buyers, estimating prices after discounts using a bar model, followed by a discussion of double discounts, and solving problems related to discounts in everyday life. This finding confirms the importance of using cultural contexts and real-life experiences to develop and facilitate students' understanding of mathematical concepts, so that learning becomes more meaningful.

Bahasa Indonesia

Kesalahan umum yang dilakukan siswa dalam memahami konsep diskon, khususnya diskon ganda, adalah menjumlahkan langsung kedua persentase diskon tanpa mempertimbangkan urutan penerapan dan perubahan dasar pengurangan setelah diskon pertama diterapkan. Penelitian ini bertujuan mengembangkan lintasan pembelajaran yang membantu siswa memahami konsep diskon tunggal dan diskon ganda melalui konteks daftar menu New Math Pempek dengan pendekatan Pendidikan Matematika Realistik Indonesia (PMRI). Penelitian ini menggunakan metode design research yang terdiri dari tiga tahap: preliminary design, design experiment, dan retrospective analysis. Subjek penelitian adalah 35 siswa MTs Darul Ulum Belitang, Sumatera Selatan. Data dikumpulkan melalui rekaman video pembelajaran, lembar kerja diskusi peserta (LKDP), catatan observasi selama siswa berdiskusi, dan wawancara. Hasil penelitian menunjukkan bahwa lintasan pembelajaran yang dirancang mampu memfasilitasi pemahaman siswa terhadap konsep diskon tunggal dan double diskon dari tahap informal ke tahap formal. Temuan ini menegaskan pentingnya penggunaan konteks yang bermakna dan berbasis budaya lokal dalam pembelajaran matematika untuk meningkatkan pemahaman konseptual siswa.

Kata kunci

• Design Research
• double discount
• new pempek math
• PMRI