The "M+" key can be used to add a list of values. The advantage of using the M+ key over entering a "123+456+...." formula is that you can review and correct the individual values using the List Manager and get an updated sum without having to re-enter all of the values if you make a mistake.
|Start by Clearing the M+ list.||Shift CM|
|Append to the list.||123 M+||123.00|
|Append to the list.||456 M+||579.00|
Note that the display is updated with the sum of the list. Tap RCL, RM to recall the sum at a later time.
The History details will have a record of the list values that you can view and share. You can also restore the list at a later time from the History details.