Roy, Meldariani and Indra Putri, Ratu Ilma and Somakim, , (2013) *STUDENT’S ABILITY TO CONSTRUCT MATHEMATICAL IDEAS IN THE TOPIC OF COORDINATE CARTESIAN SYSTEM IN PRIMARY SCHOOL.* In: Zulkardi(Eds). The First South East Asia Design/ Development Research (SEA-DR) International Conference, April 22nd-23rd, 2013, Unsri, Palembang.

## Abstract

Design Research results are presented from a study in which student’s ability to construct mathematical ideas. The concept of fundamental mathematical ideas in this study are used by students in finding formal mathematical form that depart from the context of science and cosmology through PMRI approach (Pendidikan Matematika Realistik Indonesia). HLT (Hypothetical Learning Trajectory) that are designed in 4 activities which contains a series of learning processes that will see the mathematical ideas that students used to solve any given problem. Based on the results of a pilot experiment, the mathematical ideas are used by students in constructing their own understanding of the context are approximation, geometric shape, locating, measuring, number / counting, and symbolization. Keywords : Fundamental mathematical ideas, HLT (Hypothetical Learning Trajectory), science and cosmology context, PMRI.

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