Negative Numbers - HP -18C Owner's Manual

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.
8 3 0
-25.00
Calculates -75 3.
4.520
[J
7.1
[J after
0 changes the
8 1 2 0
-2.67
sign of 7.1.
1: Starting to Use the HP-18C 21