Since updating my students' TI-84 calculators to the 2.53MP OS last year, I no longer have to constantly remind the students to keep the full number when doing subsequent calculations. With this OS, the students can select any previous answer they have found on their calculators and use that in their current calculation. All they have to do is scroll up until their cursor is on the answer they want to use. This is really helpful and saves me a lot of aggravation. I hope this helps!