HP -11C Owner's Handbook Manual page 13

1. Key in the first number.
2. Press
[ENTER|to separate the first number from the second.
3. Key in the second number.
4. Press the function key(s).
Keystrokes Display
2 2
ENTER 2.0000
3 3
# 0.6667
Section 1: Getting Started 23
When working with your HP-11C's other two-number functions
(such as [*]), remember that the number designated by x on the key
is always the last number to be keyed in. For example, to calculate
the value of 2 raised to the power of three (2°), key in 2, press
ENTER], key in the exponent, 3, then press [)"].
Keystrokes Display
2 2.0000
3 3 3is the x-value.
Co) 8.0000 2(y) raised to the third (x)
power.
Now try these problems. Notice that you have to press to
separate numbers only when they are being keyed in one
immediately after the other. A previously calculated result
(intermediate result) will be automatically separated from a new
number you key in.
To solve (2 + 4) +8:
Keystrokes Display
2 (ENTER 2.0000
4 4
G8 6.0000 (2+ 4)
8 8
+ 0.7500 (2+4)+8
To solve (9 +17 —4 + 23) +4:
Keystrokes Display
9 [ENTER 9.0000
17 26.0000 (9 +17)
4) 22.0000 (9+17—4)
23 [+ 45.0000 (9+17—4 + 23)
4: 11.2500 (94+17—4 + 23)+4
Even more complicated problems are solved in the same simple
manner—using automatic storage of intermediate results.