Monroe 2020 Plus III, Instruction Manual

11. Memory Plus Key.

 Add an amount 

directly to Memory by entering the number 
and depressing the M+ key. Depressing this 
key in the middle of an addition or 
subtraction operation adds only the last 
amount entered to Memory and does not 
complete the operation. 
You may add the result of an addition or 
subtraction calculation to Memory by 

completing the calculation with the total 
key and then depressing the M+ key. You 
may also add an intermediate result to 
Memory by using the Subtotal key in the 
same way. 
For multiplication or division calculations, 
you may use the M+ key to complete the 
operation and immediately add the result to 
Memory. 

12. Memory Minus Key.

 Subtracts an 

amount directly from Memory by entering 
the number and depressing the M- key. 
Depressing this key in the middle of an 
addition or subtraction operation subtracts 
only the last amount entered from memory 
and does not clear the operation 
You may subtract the result of an addition 
or subtraction calculation from memory by 
completing the calculation with the Total 
key and then depressing the M- key. You 
may also add an intermediate result to 
Memory by using the Subtotal key in the 
same way. 
For multiplication or division calculations, 
you may use the M- key to complete the 
operation and immediately subtract the 
result from Memory. 

13. Memory Subtotal Key.

 Prints but 

does not clear the Memory. 

14. Memory Total Key.

 Prints and clears 

the Memory. 

15. Paper Advance

. 

16. Times Key.

 To multiply, enter the first 

number (multiplicand) and depress the 
Times key; then enter the second number 
(multiplier) and depress the Equals, 
Percent, Memory Plus, Memory Minus, 
Times or Divide key to obtain a result. 
The multiplicand entry is retained as a 
constant until you depress the Times, 
Divide or Clear/Clear Entry key. 

17. Equals Key.

 Completes multiplication 

and division. 

18. Divide Key. 

To divide, enter the 

number to be divided (dividend) depress 
the Divide key. Then enter the second 
number (divisor) and depress Equals, 
Percent, Memory Plus, Memory Minus, 
Times or Divide key to obtain a result. 
The divisor is retained as a constant until 

you depress the Times, Divide or 
Clear/Clear Entry key. 

19. Backspace Key.

 Deletes right most 

character of a live entry, moving the 
remaining display value one character to 
the right. 

20. Clear/Clear Entry Key.

 (a) If the last 

key depressed was numeric, depression of 
the Clear/Clear Entry key will automatically 
clear the entry. (b) Depressing the 
Clear/Clear Entry key again or after a 
function key will cause a zero amount and 
“C” audit to print on the tape and will 
automatically clear pending calculation and 
the Accumulator. 

21. Percent Key.

 The Percent key 

automatically converts a number to a 
percent and completes a percentage 
calculation when used with the Times or 
Divide key. In percentage calculations using 
multiplication, depressing the Plus or Minus 
key immediately after the result has 
printed, will perform add-on or discount 
calculation respectively. 

22. Markup.

 From a known cost of goods 

and desired gross margin, this key 
automatically calculates and prints the 
amount of Markup and the selling price. 

23. Percent Change/Gross Margin Key.

Automatically compares any two amounts, 
prints the actual numerical difference 
between them, then calculates and prints 

the percent change. 

24. Tax Plus.

 When pressed after the Tax 

key, it completes the entry of a stored tax 
rate. When pressed after a numeric entry or 
completed calculation it prints the amount 
of the entry or completed calculation and 
the tax rate. If the rate is a positive value, 
it calculates and prints the amount of the 
tax and the total of the amount of tax and 
original entry or calculation amount. If the 

rate is a negative value, then the discount 
amount is calculated and printed followed 
by the resulting effect of the discount on 
the original entry or calculation result. 

25. Grand Total Key.

 Depressing this key 

causes the contents of the Grand Total 
memory to be printed and/or displayed and 
then clears the Grand Total memory. 

26. Tax.

 Identifies the entry value as a tax 

or discount rate to be stored when this key 
is followed by depression of the Tax+ key. 

27. Change Sign Key.

 Changes the sign 

of the entered or calculated value currently 
in the display. This key is also used to 
define the entry in the Tax, Tax+ key 
sequence as a discount factor. 

On-Off Switch.

 Located on the side of the 

calculator. 

Decimal System.

 With the 2020 Plus II, 

entries may contain any combination of 
whole and decimal digits, up to a maximum 
of 12 digits. Internally there is a 12-digit 
calculating capacity. The decimal setting 
may be changed between calculations 
without affecting the accuracy of a number 

entered or accumulated. 

Add Mode.

 Set the Decimal Selector at 

Add Mode (+) and the last two digits in any 
entry followed by depression of the Plus, 
Minus, Memory Plus or Memory Minus key 
will automatically be accepted as decimals. 
Exception: if an actual decimal entry is 
made, the calculator will accept and print it, 
overriding the Add Mode (+) setting for 
that entry. 

Error/Overflow.

 When an error or 

overflow condition occurs, the word Error is 
printed on the tape. the error/overflow is 
cleared by depressing the Clear/Clear Entry 
key. 

Automatic Punctuation.

 On the tape and 

display a comma automatically punctuates 
every third whole digit to the left of the 
decimal point. 

Underflow.

 In a result or total containing 

a combination of whole and decimal digits, 
the decimal point will shift right, regardless 
of decimal setting in order to show the 12 
most significant digits.