Finally, several factors caused the students learned more in the animated learning mode. First, animation activities through the use of computer can reinforce students’ learning motivation. This supports the finding of previous studies that the integration of technology into mathematics classes has a positive effect on learning and motivation (Isiksal & Askar, 2005; Lin, 2008; Olkun, Altun, & Smith, 2005; Yang & Tsai, 2010). Second, the audio, words and visual display can simultaneously enhance the learning of number sense. This supports the finding of earlier studies that students may learn more from multimedia-based learning environment due to multimedia messages including words and visuals than what traditional teaching modes can do (Gegner et al., 2009; Mayer, 2003). Third, learning by doing is a good approach to promote students’ learning. During manipulating the computerized activities, students will focus their attentions on the animation. Thus, it facilitates their number sense development.In summary, the present study demonstrates that the integration of technology into number sense learning by appropriately utilizing multimedia allows learners to study visually, interactively, and effectively. However, the development of computer-animated number-sense activities is a complicated and time-consuming process. It requires the collaboration of mathematics educators who are specialists in number sense, computer programmers who are well experienced in writing such programs, and computer-animation designers. Therefore, to further the development of these animated activities, it may be necessary to have an educational center that can organize and design these computer- animated activities for self-directed learning.