Mobile device has become a common gadget among the society. The once known only for the wealthy, the device allows people to communicate, work and play. Playing mobile games in mobile devices has become a trend as it can be played anywhere, anytime. Mobile device has properties like portability, connectivity and social interactivity that make it a preferred platform for learning. Hence, the usage of mobile devices can be expanded to mobile learning, where the learning environment is not restricted in classroom only. Computer games can also be highly effective in increasing children's learning and enjoyments of mathematics. By combining the fun factor of mobile games, the flexibility of mobile learning and the benefits of games, mobile educational games was developed. This paper discusses the model for the development of a mobile educational game for primary one mathematics education. The model describes the components that are required for the development of a mobile learning. The components for the model are the learning theories, learning approach, gaming approach, and the delivery medium. The prototype development process combines the instructional systems design and the game development approach. The developed prototype has been successfully tested using the functionality test which tested the govern on stability, correctness of game mechanics and integrity of game assets. The result showed that learning Mathematics on the mobile devices through gaming approach is possible and can become a promising alternative learning approach.