You can also see the RPN versions page for more information on these models. 37 RPN works the same way. Take your new calculator and key in 25. The result of 37 will immediately be displayed. This also works for more than two numbers.
Many functions require only one number.
On an RPN calculator, you still enter the number and then press the operation key and see the result. To compute e 5 press 5 e x . You now know how to use your calculator in the most basic way. The beauty of RPN is that this model extends to arbitrarily complex expressions without parentheses and precedence rules. To understand this, you'll want to know more about the stack.