×23

————

In this way, 3× 134 is used first, and 2× 134 is calculated by changing one line. Remember that the difference between two values is one bit, and then add them together to get the final result.

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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.