2。 Try to approximate the divisor to an integer 10.

3。 After trying the quotient, try to multiply the quotient by the divisor to see if it is reduced enough. If the drop is not enough, it means that the quotient is large and the drop is enough, that the remainder is greater than the divisor, that the quotient is small and the remainder is less than the divisor, which proves that the trial and error is wrong.

4。 Write down the correct quotient to be calculated.