Aan Hendroanto

TL;DR: The authors used the descriptive method with the qualitative approach and supported with quantitative data to investigate how mathematics education students in Universitas Ahmad Dahlan solve PISA mathematics problems and found that 65.7% of students were able to understand the problems and plan their strategies to solve them, while only 46.9% among them could answer correctly.

TL;DR: In this paper, the authors identify the development level of students' geometric thinking in mathematics education department, Universitas Ahmad Dahlan based on van Hiele's theory, which is a descriptive qualitative research with the respondents as many as 129 students.

Abstract: Spatial orientation and spatial visualization are the foundation of students’ spatial ability. They assist students’ performance in learning mathematics, especially geometry. Considering its importance, the present study aims to design activities to help young learners developing their spatial orientation and spatial visualization ability. Photography activity was chosen as the context of the activity to guide and support the students. This is a design research study consisting of three phases: 1) preparation and designing 2) teaching experiment, and 3) retrospective analysis. The data is collected by tests and interview and qualitatively analyzed. We developed two photography activities to be tested. In the teaching experiments, 30 students of SD Laboratorium UNESA, Surabaya were involved. The results showed that the activities supported the development of students’ spatial orientation and spatial visualization indicated by students’ learning progresses, answers, and strategies when they solved the problems in the activities.

TL;DR: This study is a descriptive qualitative research about the visualizer's paperwork and interviews provide opportunities to get additional description about her mathematical conceptions and how her understanding about functions by using representation is enriched.