There is a program on reading lang's tablet, which is notes. You can open your notebook and write a handwritten column vertically.

There are two main points in the calculation of column vertical pen. The same numbers are aligned, starting from the unit. The horizontal formula is written from the left end of the horizontal grid in the math book. The first addend of the horizontal formula is written below the second addend. The horizontal plus sign is aligned with the plus sign, and the same digits of the addend, addend and sum must be aligned.