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How to calculate the vertical calculation of mathematical division in the first volume of the fourth grade
Law of integer division

(1) Start with the high order of the dividend, first look at how many digits there are in the dividend, and then try to divide the dividend by the first few digits. If it is smaller than the divisor, divide it by one digit as much as possible;

(2) Write the quotient on ex-dividend;

(3) The remainder after each division operation must be less than the divisor.

Such as: 64÷8

1, first write dividend, divisor, divisor as shown in the figure below:

2. Then, starting from the highest bit, 6 is not enough to divide by 8. You need to see the next digit of 6, 64, and then divide it by 8. You can write 8 on the single bit of 64.

3. Then use 8×8 to write the result of multiplication under the corresponding number, as shown in the following figure:

4. Finally, make a difference, 64-64, and the remainder is 0, as shown below:

Extended data:

Precautions for vertical division:

1, all the questions are written in the middle of the exercise book, and all the numbers are the same size;

2. Divide the digits of dividend slightly, which is convenient for quotient alignment;

3. The units of quotient and dividend are consistent;

4. Products are consistent with dividends;

5. The remainder is aligned with the digits of the dividend.

Operational nature of the Division:

1, the dividend is enlarged (reduced) by n times, and the quotient is correspondingly enlarged (reduced) by n times under the condition that the divisor is unchanged.

2. The divisor is expanded (reduced) by n times, while the dividend is unchanged, and the quotient is correspondingly reduced (expanded) by n times.