When doing mixed operations of addition, subtraction, multiplication and division in grade two, isn't it required that oral arithmetic be vertical?
Of course. In mathematical operations, there is no requirement for the process, so there is only one requirement for the correct result. All roads lead to Rome, and the Eight Immortals cross the sea to show their magical powers. You can use any method you know to calculate the process and get the correct result. So you can use the column vertical style, which is also a great choice.