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In this paper, the development of the MAR (mobile augmented reality) remedial teaching program is described. It allowed students to manipulate augmented objects through AURASMA app via internet and find leads to solve geometry problems regarding compound-cube-surface area. In order to foster students' spatial abilities, the program provided specific functions included partition, complementation, recombination, and multi-perspective to promote their “mental image” as well as “visualization.” The proposed program was evaluated with the quasi-experimental pre-test/post-test control group design to probe into students' learning performance. Moreover, students' error types of problem-solving were analyzed using their solving track recorded in the sheets. The results showed that the MAR remedial teaching program truly benefit students on solving geometry problems regarding compound-cube-surface area, and there are still some questions needed to investigate in the future, such as how students were affected by visual-obscuration to inexactly carry out their counts.

From random interviews of mathematics teachers, the researchers are conscious that students have difficulties in solving problems regarding compound body volume measurement. The researchers found the main factor involved in the difficulties was incomplete spatial concepts. Augmented reality (AR), which is a kind of educational technology, has been widely applied in the educational field in recent years. AR provides two- or three-dimensional objects and/or information and interaction with them. These characteristics can compensate for the insufficient characterization of compound-body volume in traditional education environments. The paper studies evaluation in utilizing free augmented reality to learn volumetric measurement of compound bodies to complete spatial concepts as well as improve the students' learning performance. The finding suggests that the positive impact on visualization and interaction as well as attitude lead students to be more engaged in learning activities with less cognitive effort, resulting in better learning performance.