1, three digits divided by one digit vertical, first list the basic vertical of divisor and dividend; The ratio from the highest dividend to the dividend.

2. If the first digit is greater than the divisor, the quotient of the quotient is in the first digit (the quotient multiplied by the divisor is less than the first digit of the dividend), and the product of the quotient and the dividend is written in the first digit of the dividend. Calculate the difference between the first digit of the dividend and it, shift the dividend for the next time, and repeat the previous step until the calculation is completed.

3. If the first digit of the dividend is less than the divisor, move it back one place in turn. Use the ratio of the first two digits of the dividend from the high position to the divisor, and then press the previous step in turn until the calculation is completed.

On the operational nature of 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.

3. Nature of division: dividing the dividend by two divisors is equal to dividing by the product of these two divisors. Sometimes simple operations can be performed according to the nature of the division.

For example: 300 ÷ 25 ÷ 4 = 300 ÷ (25× 4) = 300 ÷100 = 3.