HP HP-21 - Page 13

For example, you add 12 and 3 by pressing:
12 The first number .
Separates the first number from the second.
3 The second number.
The function.
The answer, , is displayed.
Other arithmetic functions are performed the same way:
To perform Press Display
-3 REEE
2x3 REESE
R+3 REEDSE
The key is also a two-number operation. It is used to raise
numbers to powers, and you can use it in the same simple way
that you use every other two-number function key:
1. Key in the first number.
2. Press to separate the first from the second.
3. Key in the second number (power).
4. Perform the operation (press [l ).
When working with any function key (including ), you
should remember that the displayed number is always desig-
nated by x on the function keys.
The number displayed is always x.
Thus, to calculate 3¢:
Press Display
3 ]
3.00
6 6 is now designated by x.
s 729.00 The answer.