Problems needing attention in vertical multiplication calculation;

1, the last digit of two numbers should be aligned.

2. Write as many numbers as possible above, and write as few numbers as possible below to reduce the times of multiplication.

Extended data

Vertical calculation method:

1, the formula is obtained by mixed operation. Look carefully, calculate multiplication and division first and then add alkali. When you encounter brackets, you should count them first, and the application rules should be changed. There are some data to memorize and skills to master.

2, addition and subtraction, quick addition and subtraction, quick calculation, don't worry, get the formula to see clearly, close to the whole hundred rounded integers, the following treatment is not fallacious. If you don't add enough, you will reduce the complement and add the extra score to the end. If the subtraction is insufficient, add the complement, and then subtract the excess score.

3, multi-digit reading method is very easy, first four levels. We should start from the highest place, thousands, hundreds, and ten. The unit of the level reads hundreds of millions, and all zeros at the end are not read (zero at the end of the level and zero at the end of the integer), which does not involve the expression of Chinese characters.