auto mode allows you to use this adding machine by keypad-only.
auto decimal mode operates the same as auto mode but also assumes 2 decimal places so you do not need to enter a decimal point. (Entry of 5236 = 5236/100 = 52.36, if you want to enter just 52.00 you must enter 5200 when in this mode).
For either auto or auto decimal modes, precede a value with +,-,* or / for addition, subtraction, multiplication or division. Default function is +. If you just enter numbers then hit enter it will add them.
For any mode you can add a trailing % to cause the operand to be a percentage of the current total. For example, if the current total is 300 and you enter +20%, since 20% of 300 is 60, the operand will be 60 which will be added to 300. The new total will be 360.
auto mode examples:
This online computer based calculator is useful for keeping a running total or "paper trace" when adding or subtracting money such as to balance a checkbook or doing your taxes or any other calculation where you want to double check your entries. It is not an actual paper tape but you can print the page to save your results. There is a limit of 100 entries.