HP HP-18C - Negative Numbers

To add 721.07 and 223.89:
Keys:
721 . 070
223.89
Display:
721 . 07 +223.89
944 . 96
Description:
The equals sign com-
pletes
the calculation.
Once the HP-18C has completed a calculation, pressing another num-
ber key starts a new calculation. The display keeps a record of your
previous results.
Here are some additional arithmetic problems :
Keys: Display: Description:
877.35 [J
Subtraction.
930.890
-53.54
650120
780.00
Multiplication.
Negative Numbers
There are two ways to key in negative numbers:
• Key in the number and then press ~.
• If the number follows an operator, you can press [J before keying
in
the number.
Keys: Display: Description:
75~
-75 Changes the sign of 75.
830
-25.00 Calculates -75 3.
4. 520 [J 7.1
[J after 0 changes the
8120
-2.67 sign of 7.1.
1: Starting to Use the HP-18C 21