1, divisor is a two-digit pen division calculation method: divide the first two digits of the dividend by the divisor first, and if the first two digits are less than the divisor, look at the first three digits. Except for the dividend, the merchants wrote it on that. The remainder after each division operation must be less than the divisor.

2. Trial-and-error method of two-digit division in which the divisor is not an integer ten: If the divisor is a two-digit number close to the integer ten, the divisor can be regarded as the trial quotient close to its integer ten by rounding, or the divisor can be regarded as the number fifteen close to it, and then the quotient can be directly determined by multiplying one digit.

Quotient number:

(1) Two digits divided by an integer, such as 62 ÷ 30;

(2) Divide three digits by an integer, such as 364÷70.

(3) Divide two digits by two digits, such as 90÷29 (try to take the quotient of 29 as 30).

(4) Divide three digits by two digits, such as: 324÷8 1 (take 8 1 as 80, and measure the quotient).

(5) Divide three digits by two digits, such as 104÷26 (take 26 as the quotient of 25).

(6) The same-head divisor-free quotient is eight or nine, such as: 404÷42 (the highest digit of the dividend is the same as the highest digit of the divisor, that is, "the same head", and the first two digits of the dividend are not divided by the divisor, that is, "no division", that is, it is either quotient 8 or quotient 9. )

(7) The divider is half quotient four or five, such as: 252÷48 (24, the divisor is half of 48, which is very close to the first two digits of dividend 25, and it is either quotient 4 or quotient 5. )

Quotient two digits: (three digits divided by two digits)

The first two digits of (1) have a remainder, such as: 576÷ 18.

(2) The first two digits have no remainder, such as 930÷3 1.

3, the method of judging the number of digits of quotient:

Dividing the first two digits of the dividend by the divisor is not enough, and the quotient is one digit; Divide the first two digits of the dividend by the divisor, and the quotient is two digits.

3) the changing law of quotient

1, change of quotient: (1) The dividend is unchanged. If the divisor is multiplied by (or divided by) several (except 0), the quotient is divided by (or multiplied by) the same number.

(2) The divisor is a constant, and the quotient of the divisor multiplied (or divided) by several numbers (except 0) is also multiplied (or divided) by the same number.

2. The quotient remains unchanged: the dividend and divisor are multiplied (or divided) by the same number (except 0) at the same time, and the quotient remains unchanged.

(4) Simple calculation: remove the same number of zeros at the same time, such as 9100 ÷ 700 = 91÷ 7 =1.