This articles discusses the characteristics of students' mathematical understanding in solving multiple representation tasks. Qualitative explorative methods were used to clarify the characteristics of mathematical understanding. Data were obtained by assigning multiple representation tasks to and interviewing 25 students. It is concluded that there are two characteristics of mathematical understanding in solving multiple representation tasks: flexibility and compartmentalization. Flexible understanding consists of complete and incomplete flexibility. SOLO taxonomy level for students who have flexible understanding is relational. Multi-structural level refers to students whose comprehension is incomplete flexible, while uni-structural level refers to students whose understanding is compartmentalized. The findings of this study can be used as a guide to assess the depth of students' mathematical understanding and a foothold in developing learning mathematics based multiple representations.

Abstract-Rumah gadang is a Minangkabau traditional house. Rumah gadang is a stage house where the house body is enlarged upward, like a ship. While the roof resembles a buffalo horn called gonjong. This paper describes the mathematics that is embedded in the design of rumah gadang. Exploration is done through observation in the rumah gadang, interviews with tukang tuo, adat leaders and literature studies. The results show that in rumah gadang design there are concepts of numbers, measurements and geometry. The results of this exploration will be able to help teachers to use the context of rumah gadang design in learning mathematics.

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