HP HP-11C

24 Section 1: Getting Started
Example: Solve (6 +7) X (9 — 3).
First solve for the intermediate result of (6 + 7):
Keystrokes Display
6 6
6.0000
7 7
13.0000 6+7
Now perform (9 — 3). Since another pair of numbers must be keyed
in, one immediately after the other, use the key again to
separate the first number (9) from the second (3). (There is no need
to press to separate the 9 from the previous intermediate
result of 13 that is already in the calculator—the results of previous
calculations are stored automatically.) To solve (9 — 3):
Keystrokes Display
9 9
9.0000
3 3
B
6.0000
9-3)
Then multiply the intermediate results (13 and 6) together for the
final answer:
Keystroke Display
78.0000 6+7X9-3)=178
Notice that the HP-11C automatically stored the intermediate
results for you and used them on a last-in, first-out basis when it
was time to multiply. No matter how complicated a problem may
look, it can always be reduced to a series of one- and two-number
operations.
Remember:
¢ The key is used for separating the second number from
the first in any operation requiring the sequential entry of two
numbers.
® Any new digits keyed in following a calculation are
automatically treated as a new number.