The transverse formula is a transverse formula, as opposed to the longitudinal formula. Horizontal calculation is more complicated than vertical calculation, so many people like to use vertical calculation when calculating the result of an equation. The advantage of horizontal style is that it is fast in calculation and does not need to use your head. However, the horizontal type also has some disadvantages, that is, it can't make too complicated calculations, and the vertical type is used for too complicated calculations. Horizontal and vertical are collectively referred to as formulas or formulas.

There are two main points in the calculation of column vertical pen: the same digit alignment, starting from the unit. You can add ten digits first without carrying, but it is not recommended for carrying addition later. The format of exercise books is strictly in accordance with the following requirements:

The horizontal formula of 1. is written from the left end of the horizontal grid of the math book;

2. Vertical style: the first addend of horizontal style is written below the second addend, and the plus sign of horizontal style is aligned with the plus sign. The same numbers of addend, addend and sum must be aligned.

3. Finish the calculation vertically, and don't miss the number horizontally.