When writing vertical marks, write vertical marks first; Then write the dividend and divisor on the inside and left of the divisor respectively; Quotient is written on the divisor and aligned with the unit of the dividend; Finally, write the product of quotient and divisor under the dividend, and the same numbers are aligned. Take 126÷ 18 as an example. The divisor is a two-digit number, so look at the two digits on the left of the dividend first, 12 is less than 18, so the quotient is a single digit.

How to calculate vertical division:

Divide from the top of the dividend first. How many factors are there? Look at the top of the dividend. If it's not enough, watch another one. Write the quotient on the number except the dividend. If the divisor is not enough, put the quotient on this number. The remainder to be divided must be less than the divisor, and the bit dividend is placed in the right bit of the remainder.

The vertical course of hundred-digit division: Take 126÷ 18 as an example. The divisor is a double digit, so look at the left two digits of the dividend first. 12 is less than 18, so the quotient is a single digit. Then take 18 as 20 quotient. At this time, the quotient can be 6. When the quotient is 6, the remainder is 18, which is as big as the divisor. At this time, the business is small.

Then, adjust the quotient to 7, and the result is just right. Try another question, 638÷22, and take 22 as 20, and the quotient will increase. Finally, we lowered the number to 2 and the result was just right. We continue to calculate and the result is 29. Try 84 divided by 6 again. The vertical division is as follows: 8 divided by 6, the quotient is 1, then the remainder 2 and the adjacent 4 are divided by 24 and divided by 6, and the final result is 14.