Teaching mathematical concepts contains many contents such as: specific characteristics, properties, and exercises. Among them, teaching the meaning of concepts also plays an important role. The meanings of concepts are associated with the history of concepts and enable us to know the nature of concepts deeply. There are many teaching methods or ways to teach the meanings of concepts such as: designing exercises, creating situations, holding an experimental research. Here, our choice is an educational game because in teaching mathematics, it is regarded as a pleasant, amusing learning form, based on the created situation to help pupils apprehend the new knowledge, consolidate the old knowledge, skills, solution methods, the experience of life self-consciously, actively, independently and creatively. This paper offers an educational game to teach the meaning of natural numbers. The results show that students have recognized the meaning of natural numbers in the last phase of the game due to the teacher’s help.