Since the promulgation of "Mathematics Curriculum Standard for Full-time Compulsory Education (Experimental Draft)", Beijing Normal University Press, People's Education Press and Jiangsu Education Press have published a set of primary school mathematics experimental textbooks (referred to as Beijing Normal University Edition, People's Education Edition and Jiangsu Education Edition) which embody the new curriculum concept.
People's education edition mathematics, the fourth grade mainly studies decimals, fractions, figures, positions and so on. This is a link between the preceding and the following, connecting the knowledge of grade three and grade five. Generally speaking, it is not difficult (occasionally there are some difficult thinking questions and so on).
In fact, learning attitude is more important than book knowledge. It is not difficult to learn, and it is not difficult to learn. Only those who work hard can make things easy.
I won't talk big and empty, I hope it will help you.