Journal of Innovative Mathematics Learning ISSN 2621-4733 (print) Volume 3, No. 4, December 2020 ISSN 2621-4741 (online) 215 THE EFFECT OF INDUCTIVE-DEDUCTIVE APPROACH ON STUDENTS’ MATHEMATICAL CREATIVE THINKING ABILITY AND SELF EFFICACY Cecep Mahmudin 1 , Utari Sumarmo 2 , Asep Kustiana 3 1 IKIP Siliwangi, Jl. Terusan Jend. Sudirman Baros 1 cecep.mahmudin81@gmail.com Received: Aug 13 th , 2020; Accepted: Dec 2 nd , 2020 Abstract This research was a pre test-posttest experimental control group design having a goal to analyze the role of Inductive-Deductive Approach (IDA) on improving students’ mathematical creative thinking ability (MCTA) and self efficacy (MSE). Subjects of this research were 70 eleventh grade students from two classes selected purposively in a Senior High School in Garut. Instruments of this research were a MCTA test, and a MSE scale. The research found that the role of IDA was greater than the role of scientific approach (SA) on improving students’ MCTA and MSE. Students getting treatment with IDA approach obtained MCTA and MSE at good grades qualification. While students taught by SA attained MCTA and MSE at low-moderate grades level. Apart of those findings, the research found that students getting treatment with IDA encountered a litle bit difficulty in solving MCTA tasks. In contrast students taught by SA experienced in allmost items of MCTA tasks. In addition, the research also found there was no assocition between MCTA and MSE and students performed good and active learning during IDA lessons. Keywords: Mathematical Creative Thinking, Mathematical Self-Efficacy, Eliciting Activities Model (IDA) Abstrak Penelitian ini merupakan penelitian pre test-posttest experimental control group design yang bertujuan untuk menganalisis peran Inductive-Deductive Approach (IDA) dalam meningkatkan kemampuan berpikir kreatif matematis (MCTA) dan self efficacy (MSE) siswa. Subjek penelitian ini adalah 70 siswa kelas sebelas dari dua kelas yang dipilih secara purposive di sebuah SMA di Garut. Instrumen penelitian ini adalah tes MCTA, dan skala MSE. Hasil penelitian menemukan bahwa peran IDA lebih besar daripada peran pendekatan saintifik (SA) dalam meningkatkan MCTA dan MSE siswa. Mahasiswa yang mendapat perlakuan dengan pendekatan IDA memperoleh MCTA dan MSE dengan kualifikasi nilai bagus. Sedangkan siswa yang diajar oleh SA mencapai MCTA dan MSE pada tingkat kelas rendah-sedang. Terlepas dari temuan tersebut, penelitian menemukan bahwa siswa yang mendapatkan pengobatan dengan IDA mengalami sedikit kesulitan dalam menyelesaikan tugas-tugas MCTA. Sebaliknya siswa yang diajar oleh SA berpengalaman di semua item tugas MCTA. Selain itu, penelitian juga menemukan tidak ada hubungan antara MCTA dan MSE dengan siswa melakukan pembelajaran yang baik dan aktif selama pembelajaran IDA. Kata Kunci: Kemampuan Berpikir Kreatif Matematis, Matematika Self-Efficacy, Model Eliciting Activities (IDA) How to Cite: Mahmudin, C., Sumarmo, U., Kustiana, A. (2020). The Effect of Inductive- Deductive Approach on Students’ Mathematical Creative Thinking Ability and Self-Efficacy. JIML, 3 (4), 215-226.