I had a TI-82 before and I can tell you that it's night and day between these 2 products, TI-82 are super complicated changing the lower number in the middle of a calculation results in the modification of any calculating, one must retype because it is impossible to change anything when the calculation is typed, with this Casio this is very simple and does not require any retyping (saves precious time during examinations) the fraction input here is also much simpler than on IT! The figures are superimposed with a line that shows that this is a fraction while for IT must put parentheses around the denominator but on the denominator to make him understand that the division is not a priority ... If Please dispose of IT complications do not hesitate!