References
[1]. Bailey, D. H., Hoard, M. K., Nugent, L., & Geary, D. C. (2012). Competence with fractions predicts gains in mathematics achievement. Journal of Experimental Child Psychology, 113(3), 447-455. https://doi.org/ 10.1177/1535370215616511
[2]. Fauziyyah, F. A., & Kriswandani, K. (2017, August). Description profile of understanding layer concept of conic section of mathematics education students 2016 of FKIP UKSW. In 1st Annual International Conference on Mathematics, Science, and Education (ICoMSE 2017).
[3]. Kurniawan, H., Nusantara, T., Subanji, S., Susiswo, S., Setiawan, I., Sutawidjaja, A., & Muksar, M. (2016). Limited intervention at sub concept of fractions in the object conversion into fractions. International Education Studies, 9(7), 145-160. https://doi.org/10.5539/ ies.v9n7p145
[4]. Pirie, S. E. B., & Kieren, T. E. (1994a). Beyond Metaphor: Formalising within Constructivist Environments Understanding. For the Learning of Mathematics, 14(1), 39-43.
[5]. Pirie, S., Kieren, T. (1994b). Growth in mathematical understanding: How can we characterize it and how can we represent it? Education Studies in Mathematics. 26(2- 3), 165-190.
[6]. Sagala, V. (2016). Profil Lapisan Pemahaman Konsep Turunan Fungsi dan Bentuk Folding Back Mahasiswa Calon Guru Berkemampuan Matematika Tinggi Berdasarkan Gender. Journal of Mathematics Education Science and Technology, 1(2), 183- 198.
[7]. Sagala, V. (2017). Struktur Lapisan Pemahaman Konsep Turunan Fungsi Mahasiswa Calon Guru Matematika, Journal Didaktik Matematika, 4(2), 125-135.
[8]. Sengul, S., & Argat, A. (2015). The analysis of understanding factorial concept processes of 7th grade students who have low academic achievements with pirie kieren theory. Procedia - Social and Behavioral Sciences, 197, 1263-1270. https://doi.org/10.1016/ j.sbspro.2015.07.398
[9]. Susiswo, S. (2014). Folding Back Mahasiswa dalam menyelesaikan Masalah Limit (Disertasi, Universitas Negeri Malang).
[10]. Syahri & Isran. (2016). Pembelajaran Matematika dengan Model Teori Pirie dan Kieren. Edudikara, 1(1), 42- 50.
[11]. Tunç-Pekkan, Z. (2015). An analysis of elementary school children's fractional knowledge depicted with circle, rectangle, and number line representations. Educational Studies in Mathematics, 89(3), 419-441. https://doi.org/10.1007/s10649-015-9606-2
[12]. Utami, I. W., & Rosyidi, A. H. (2016). Profil Lapisan Pemahaman Property Noticing Siswa pada Materi Logaritma Ditinjau dari Perbedaan Jenis Kelamin. Surabaya. Journal Ilmiah Pendidikan Matematika, 1(5), 21-29.
[13]. Yilmaz, F. G. k., Özdemir, B. G., & Yasar, Z. (2018). Using digital stories to reduce misconceptions and mistakes about fractions: an action study. International Journal of Mathematical Education in Science and Technology, 49(6), 867-898. https://doi.org/10.1080/ 0020739X.2017.1418919