We should pay more attention to children's usual study. If they don't consciously study and can't keep up with the teacher's teaching progress at work, they should be sent to counseling. The fourth grade of primary school is to examine children's computing ability and thinking mode, which will be used in mathematics learning in the future. Being too backward is not conducive to children's future study. The child's mathematical calculation ability was not good before, because this problem affected the speed of solving problems and could not be finished during the exam. Many friends around me said that the excellent teacher next to home has the method of teaching children at this stage, so she sent her daughter to learn. Teachers will teach algorithms according to children's situation, such as teaching some fast calculation methods and teaching routine skills of multiplication and division. Now that the child is in the fifth grade, multiplication and division can be worked out directly in his head, instead of using a pen as before, it will take a long time.