It doesn't mean much to primary school students, because the content of the class is similar to that of official documents. But for kindergarten children, the effect of official documents is quite remarkable. Because at least the questions in the first and second grades of primary school (addition, subtraction, multiplication and division) can be mastered, the learning pressure will be reduced. Therefore, it depends on the purpose of parents to let their children learn. Our kindergarten opened the official document, studied for a year, and realized multiplication. I think on the one hand, the progress is too fast, and children will learn multiplication and division in large classes. However, my children enjoyed the whole first grade because of the speed and accuracy of practicing oral arithmetic and mental arithmetic with official documents; Now the first grade has introduced the basic concept of multiplication, and I am going to start official document mathematics in the summer vacation. Starting from grade C, there is no other purpose, that is, to practice speed so that the school's mental arithmetic and oral arithmetic can pass; I will stop when my children have finished learning Grade C and Grade D. Personally, I feel that it is more appropriate to use official documents as an auxiliary exercise book for school mathematics.