Efektivitas PJBL Konteks Bola Susu Terhadap Pemahaman Perkalian Pecahan Siswa Sekolah Dasar
DOI:
https://doi.org/10.67686/didaktika.v10i3.2309Abstrak
Penelitian ini dilatarbelakangi oleh masih munculnya miskonsepsi siswa pada materi perkalian pecahan, khususnya kecenderungan bias bilangan asli yang menganggap bahwa operasi perkalian selalu menghasilkan nilai lebih besar. Kondisi ini menunjukkan lemahnya pemahaman konseptual siswa dan dominasi prosedural dalam pembelajaran matematika. Penelitian ini bertujuan menguji efektivitas Project-Based Learning berbasis aktivitas kontekstual pembuatan bola susu dalam meningkatkan pemahaman konsep perkalian pecahan pada siswa kelas VI sekolah dasar. Penelitian menggunakan pendekatan kuantitatif dengan desain quasi-experiment tipe non-equivalent control group design. Subjek penelitian terdiri atas 12 siswa kelas eksperimen dan 20 siswa kelas kontrol. Instrumen berupa tes uraian berbasis indikator pemahaman konsep. Data dianalisis melalui uji normalitas, uji t, dan perhitungan N-Gain, serta dilengkapi analisis kualitatif jawaban siswa. Hasil penelitian menunjukkan tidak terdapat perbedaan kemampuan awal, namun terdapat perbedaan signifikan pada posttest (p = 0,001) dan N-Gain ((p < 0,001). Rata-rata N-Gain kelas eksperimen (0,54) lebih tinggi dibandingkan kelas kontrol (0,31). Temuan kualitatif menunjukkan pergeseran pemahaman siswa dari prosedural menuju konseptual, meskipun miskonsepsi belum sepenuhnya hilang. Disimpulkan bahwa PjBL berbasis aktivitas kontekstual efektif meningkatkan pemahaman konsep perkalian pecahan dan berpotensi mengurangi miskonsepsi siswa.
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