Reverse polish Notation (RPN)

Hewlett Packard is the only calculator maker that offers RPN on its advanced calculators either as a standard or an optional entry method.

RPN is standard on HP 12c, selectable on HP 12c Platinum, HP 17BII+, HP 35S, HP 48GII and HP 50G

Benefits:

• RPN saves time and keystrokes. You never have to account for the parentheses while doing calculations. The process is similar to the way you learned math on paper.
• You can see the intermediary results as you perform your computations rather than just the answer at the end. This is an extremely helpful byproduct. Math teachers are using this feature to improve student understanding of mathematics
• An intermediate result allows the user to check the results and correct errors more easily. It's easier to follow the stream of calculation. The user defines the priority of operators.
• RPN is logical because the user first gives the number and then tells what to do with it.