Because it can calculate better, reduce errors in operation and facilitate inspection. A simple mathematical operation method.

In the calculation process, each transition number is changed by the last transition number, and then the single digit of the last transition number is multiplied by 2. If you need to carry, go forward 1, then increase the unit by ten digits, and so on, and add a new operand to the unit. The mathematical calculations that can be carried out in vertical calculation include the most basic four operations (namely, addition, subtraction, multiplication and division).

Extended data:

Vertical calculation skill

1. When calculating the addition vertically, align (the same number). Starting from (digits), digits add up to ten, like the top ten digits (1).

2. When calculating the subtraction vertically, align (the same number). If the number of digits is not enough, borrow (10 digits) to reduce it.