In the fourth grade, the first and second volumes of mathematics are all studied together. Because a book is divided into two volumes, there must be a joint relationship. Because the length of chapters in the book is also limited, many unanswered questions in the first book will continue to be answered in the second book, and new knowledge that was not involved last time will be fully answered in the second book. So the fourth grade math books are all studied together. The fourth grade is a key turning point in primary school. Maybe the child's grade in senior one, senior two and senior three is good, but because he didn't master a suitable method, it's just because the knowledge points are really basic and simple, and there is no gap in the whole class. However, once you reach the fourth grade, the gap in grades will gradually emerge, because there are more and more knowledge points to learn, and the difficulty has been rising. Therefore, once there is no suitable method for you, it will be passive and more difficult to learn. In addition, the logical thinking of mathematics is very rigorous, so it is necessary to cultivate children's logical thinking ability as soon as possible, otherwise it will be more difficult to learn later. Of course, in addition, children also need to have certain summing-up and organizational skills. In order to help everyone, the teacher specially sorted out the summary of mathematics knowledge points in grade four, hoping to help everyone. Elementary school mathematics: induction of key knowledge points in grade four.