Explain that the child's mathematics foundation is not very good, many problems can't be done, and he has no sense of accomplishment, which leads to his boredom with mathematics. You can not give her the foundation first, but give her the most basic questions in Grade Two. It is not difficult, but the knowledge points involved are the same. Practice for a while and then slowly improve the difficulty, or both at the same time. Besides, give her a suggestion. If the foundation is not good, it must be a teacher at school.