When mental math is not an option, standard long division steps provide an infallible path to the solution. The process tests how many times the denominator divides into the numerator.
Set up the problem with 3 as the dividend inside the bracket and 4 as the divisor outside. Since 4 cannot divide into 3 a whole number of times, place a 0 above the division line, add a decimal point immediately after it, and attach a trailing zero to the 3, turning it into 3.0.
Now evaluate 4 dividing into 30. Four fits into 30 a total of 7 times, producing 28. Subtracting 28 from 30 leaves a remainder of 2. Bring down another zero to create 20. Four fits into 20 exactly 5 times (4 × 5 = 20), leaving a remainder of 0. The quotient reads 0.75. Appending this fractional calculation to the existing integer 4 confirms the result: 4.75.
