HP HP-67 - Page 41

Getting Started 37
You work through the problem the same way with the HP-67. First
you solve for the intermediate result of (2 + 3)....
Press Display
il
Intermediate result.
Then add 4 and 5:
(Since you must now key in another pair of numbers before you can
perform a function, you use the EfiZilJ key again to separate the first
number of the pair from the second.)
Procedure Press Display
;;A;WM 1ENETD 50
9
Then multiply the intermediate answers together for the final answer:
Procedure Press Display
Notice that you didn’t need to write down or key in the intermediate
answers from inside the parentheses before you multiplied—the
HP-67 automatically stacked up the intermediate results inside the
calculator for you and brought them out 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.
Just
work
through
the;
problem
in
the
same
logical
order
you
would
use
if
you
were
working
it
with
a
pencil
and
paper.