Fokus Penelitian Ini Adalah Kesulitan Belajar Matematika Siswa Pada Materi Menghitung Luas Bangun Datar Trapesium Dan Layang-Layang Dalam Bentuk Soal Cerita Matematika Dan Faktor-Faktor Penyebab Kesulitan Belajar Matematika Pada Siswa Kelas V-C SDN 050 Tarakan. Jenis Penelitian Yang Digunakan Adalah Penelitian Kualitatif Deskriptif Yang Dilaksanakan Di SDN 050 Tarakan Tahun Ajaran 2017/2018. Informan Dalam Penelitian Ini Ada 2 Guru Dan 3 Siswa Dengan Kemampuan Tinggi, Sedang Dan Rendah. Teknik Pengumpulan Data Penelitian Ini Adalah Wawancara, Observasi Dan Dokumentasi. Teknik Analisis Data Penelitian Ini Adalah Reduksi Data, Penyajian Data Dan Penarikan Kesimpulan.
Berdasarkan Hasil Penelitian Bahwa Pada Dimensi Kelemahan Dalam Menghitung Siwa Kemampuan Tinggi, Sedang Dan Rendah Mengalami Kesulitan Karena Siswa Tidak Mampu Mendefinisikan Makna Dari Huruf, Simbol Dan Istilah Matematika. Dimensi Kedua Kesulitan Dalam Mentransfer Pengetahuan, Siswa Kemampuan Tinggi Dan Sedang Tidak Mengalami Kesulitan. Namun, Pada Siswa Kemampuan Rendah Mengalami Kesulitan Karena Tidak Mampu Menangkap Konsep Soal Dengan Benar Dengan Menulis Dan Menyebutkan Diketahui Dan Ditanyakan Serta Rumus Yang Digunakan Dalam Soal. Dimensi Ketiga Pemahaman Bahasa Matematika Yang Kurang Pada Siswa Kemampuan Tinggi Dan Sedang Tidak Mengalami Kesulitan. Namun, Pada Siswa Kemampuan Rendah Mengalami Kesulitan Karena Tidak Mengetahui Tahap-Tahap Yang Dilakukan Selanjutnya Serta Tidak Mampu Memberikan Kesimpulan Akhir Dari Soal. Hasil Kedua Yaitu Faktorfaktor Penyebab Kesulitan Belajar Matematika Pada Siswa Kelas V-C SDN 050 Tarakan Terdiri Dari Faktor Internal Dan Faktor Eksternal. Faktor Internal Meliputi Daya Serap/Kecerdasan Siswa, Sikap Siswa Terhadap Pembelajaran, Minat Siswa Terhadap Pembelajaran, Dan Motivasi Siswa Terhadap Pembelajaran. Sedangkan Faktor Eksternal Meliputi Hubungan Guru Dengan Siswa, Kondisi Ruang Kelas/Sarana Penunjang Dan Penggunaan Media Pembelajaran.

Kata Kunci: Kesulitan Belajar Matematika, Faktor Penyebab Kesulitan Belajar Matematika

The Focus Of This Research Was The Difficulty Of Learning Mathematics Of Students In The Material To Calculate The Flat Building Area Of Trapezoid And Kite In The Form Of Mathematical Story Problems And The Factors That Caused Learning Difficulties Of Mathematics In Students Of Class V-C SDN 050 Tarakan. The Method Which Used In This Research Was Descriptive Qualitative Research Conducted At SDN 050 In The 2017/2018 School Year. The Informants In This Study Were 2 Teachers And 3 Students With High, Medium And Low Abilities. Data Collection Techniques In This Research Were Interview, Observation And Documentation. The Technique Of Analysis Data Was Data Reduction, Presentation Of Data And Conclusions. Based On The Results Of The Research That The First Dimension Was The Weakness Of High, Medium, And Low Ability Students Having Difficulty In Calculating Because Students Unable To Define The Meaning Of Letters, Symbols And Mathematical Terms. The Second Dimension Was The Difficulties In Transferring Knowledge The Students That Have High And Medium Ability Were No Trouble. However, The Low Ability Students Have Difficulty Because They Were Unable To Get The Concept Of The Questions Correctly By Writing And Mentioning Known Questions And The Formulas Used In The Questions. The Third Dimensions Of Understanding Mathematics Language That Is Lacking, The Students That Have High And Medium Ability Were No Trouble. But, The Students Who Have Low Abilities Have Difficulty Because They Did Not Know The Next Step And They Were Unable To Provide The Final Conclusions From The Question. The Second Result Was The Factors That Cause The Difficulty Of Learning Mathematics In Students At V-C Class Of SDN 050 Tarakan Consist Of Internal Factors And External Factors. Internal Factors Include Student Intelligence, Students' Attitudes Toward Learning, Students' Interest In Learning, And Students' Motivation For Learning. While External Factors Include Relations Between Teacher And Students, Classroom Conditions/Supporting Facilities And The Use Of Learning Media. Keywords: Difficulties Of Learning Mathematics, Factors Of Caused The Difficulties In Learning Mathematics