The answer process is as follows:

(1) Mathematical expression of five greater than four: (5-4)÷4, (5-4)÷4 These are four operations. Calculate what is in brackets first, and then calculate the division. (5-4)÷4=0.25, and the percentage of 0.25 is 25%.

(2) Mathematical expressions with 4 less than 5: (5-4)÷5, (5-4)÷5 These are four operations. Calculate what is in brackets first, and then calculate the division. (5-4)÷5=0.2, and 0.2 is converted into a percentage of 20%.

Extended data:

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.

The law of fractional division in which divisor is decimal;

1) First look at how many decimal places the divisor has, and then move the decimal point of the divisor to the right by a few places. If there are not enough decimal places, use zero to make up;

2) Then divide by the fractional division of integer divisor.