4- 10 years old can be used. My son started using it in the second grade, and his math scores were a mess before. He listened to the teacher and gave him a concept of the number planet. I saw that he gradually became interested in mathematics, and gradually got used to playing games with the digital induction planet at a fixed time, and gradually fewer and fewer students worked together. At the end of the term, the teacher specially praised him, saying that he had made remarkable progress? Therefore, I think it is still very effective. Pay attention to the cultivation of children's interests and benefit from early use.