HP 35s

2-10 RPN: The Automatic Memory Stack
Example:
Suppose you made a mistake while calculating
16 × 19 = 304
There are three kinds of mistakes you could have made:
Reusing Numbers with LAST X
You can use  to reuse a number (such as a constant) in a calculation.
Remember to enter the constant second, just before executing the arithmetic
operation, so that the constant is the last number in the X–register, and therefore can
be saved and retrieved with
.
Example:
Calculate
Wrong
Calculation:
Mistake: Correction:


Wrong function
Ù



Wrong first number



Wrong second number
 
3947.52
3947.52704.96 +