This study developed augmented reality (AR) tools to help elementary school students learn enumeration strategies-layer strategy and the formula strategy, for calculating the volume of cubes. A quasi-experiment design was conducted in this study to evaluate the effectiveness of the AR tools. Two classes with a total of 52 students participated in the study. One class with 28 students used the physical cubes to learn the enumeration strategies, whereas the other class with 25 students used the physical cubes combined with the AR tools. Our findings showed that students using the AR tools with physical cubes (1) performed better in achievement test, (2) became more confident on learning while applying the layer strategy, and (3) were more satisfied with the learning activities, as compared to students without the AR tools. The AR tools also helped students better understand the move and fill process for forming a cuboid, and promoted them to implement the volume formula in a meaningful way.