The vertical method should be taught to students, and some questions need to be calculated vertically, otherwise they will suffer. In addition, it is easy to teach multi-digit addition and subtraction in grade two. Otherwise, it will be too difficult for a while. Students are not easy, and teaching is more difficult. The vertical calculation of division with remainder in grade two also uses vertical subtraction. It is better to teach than not to teach, and the person who gave the question doesn't know much about the textbook. Other students didn't teach badly, but they didn't do well in the exam. It is better not to teach students under 20 in the first semester of senior one, so it is easier to train students' oral expression ability. Two digits plus one digit and two digits plus two digits must be taught in the second semester.