SUPPORTING THE DEVELOPMENT OF STUDENTS’ REFERENCE POINTS FOR LENGTH ESTIMATION
| Main Authors: | Hartono, Rudi, Ilma, Ratu, Hartono, Yusuf |
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| Format: | Proceeding PeerReviewed application/pdf |
| Terbitan: |
, 2015
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| Subjects: | |
| Online Access: |
http://eprints.unsri.ac.id/5783/1/hartono.pdf http://eprints.unsri.ac.id/5783/ |
Daftar Isi:
- This study reports a part of a full study aimed to improve local instructions theory on mathematics education for supporting to develop students’ reference points for length estimation. We design 5 classroom activities using Realistic Mathematics Education (RME) approach with Indonesian contexts through approximating and estimating tasks. Measuring relatively long object in lompat katak and lompat pocong game and approximating from Indonesian traditional games photographs build understanding of physical unit iteration and naturally shift from the use of rulers to use reference points.. Meanwhile, estimating the height of a classroom, and the height of a flag pole push the use of mental reference points and connecting body parts to external object as new reference points. The participants of this study are four 4th graders of MIN 2 Palembang. We collect data from students’ work, classroom observation and interviews with the participants then we analyze the data mostly in qualitative ways. The results suggest that the students use guessing, employ reference points in form of body parts (arm spans, body height, etc) or external objects (height of a bookshelf, height of a room, etc.) and also mentally iterate IFR especially one meter unit by imagine the length of an arm spans to the to-be-estimated objects. Keywords: Reference points, Estimation, Approximation, PMRI, RME, local instructions theory, design-based research, hypothetical learning trajectory