Section 3: Automatic Memory Stack and ALPHA Register53
 Keystrokes Display 287 ENTER 287.0000 12.9  ÷ 22.2481 Oops! The wrong number. g LASTX 12.9000 Retrieves the last entry. × 287.0000 You are back at the beginning. 13.9  ÷ 20.6475 The correct answer.
Remember, if you key in the wrong digits and discover them prior to executing a function, you can use    to edit the number.
In the above axample, when first  ÷  is pressed, followed by g LASTX, the contents of the stack and LAST X registers are changed...
...from this...       ...to this...       ...to this...
T  0.0000         T  0.0000         T  0.0000
Z  0.0000         Z  0.0000         Z  0.0000
Y  287.0000       Y  0.0000         Y  22.2481
X  12.9000    ÷      X  22.2481   g  LASTX  X  12.9000

 LAST X 12.9

Recovering a Number for Calculation
The LAST X register is useful in calculations where a number occurs more than once. By recovering a number using LASTX , you do not have to key that number into the calculator again.
For example, calculate
 96.704 + 52.394706 52.394706
 Keystrokes Display 96.704 ENTER 96.7040 52.394706  + 149.0987 Intermediate answer. g LASTX 52.3947 Recalls 52.394706 to the X-register. ÷ 2.8457 The answer.
###### Constant Arithmetic
You may have noticed that whenever the stack drops because of a two-number operation (not a R  ), the number in the T-register is reproduced there. This stack operation can be used to insert a constant into a problem.