We can see that there are several steps in fractional division, 1. First of all, it is divided from high to low. Second, each number should be added with the remainder of the previous number to form a new number, and the divisor is compared. Third, when the new number is greater than or equal to the divisor, the author will ask for the remainder. Fourth, complete the division operation in the above way until the last dividend. The purpose of division is to find the quotient, but when you suddenly can't see how many quotients are contained in the dividend, you can use the method of trial quotient and estimated quotient to see how many divisors are contained in the highest digit of the multiplicand (that is, how many times the quotient is contained), and then add several times the complement from the standard number to get the quotient.