HP 12C Financial calculator - Manual (Page 22)

22 Section 1: Getting Started
File name: hp 12c_user's guide_English_HDPMBF12E44 Page: 22 of 209
Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm
Your hp 12c calculates the answer in just the same way:
Keystrokes Display
3\4§ 12.00 Step 1: Multiply the numbers in the
first parentheses.
5\6§ 30.00 Step 2: Multiply the numbers in the
second parentheses.
+ 42.00 Step 3: Add the results of the two
multiplications.
Notice that before doing step 2, you did not need to store or write down the result
of step 1: it was stored inside the calculator automatically. And after you keyed in
the 5 and the 6 in step 2, the calculator was holding two numbers (12 and 5)
inside for you, in addition to the 6 in the display. (The hp 12c can hold a total of
three numbers inside, in addition to the number in the display.) After step 2, the
calculator was still holding the 12 inside for you, in addition to the 30 in the
display. You can see that the calculator holds the number for you, just as you
would have them written on paper, and then calculates with them at the proper
time, just as you would yourself.
* But with the hp 12c, you don’t need to write
down the results of an intermediate calculation, and you don’t even need to
manually store it and recall it later.
By the way, notice that in step 2 you needed to press \ again. This is simply
because you were again keying in two numbers immediately following each other,
without performing a calculation in between.
To check your understanding of how to calculate with your hp 12c, try the
following problems yourself. Although these problems are relatively simple, more
complicated problems can be solved using the same basic steps. If you have
difficulty obtaining the answers shown, review the last few pages.
00 . 77 ) 6 5 ( ) 4 3 ( = + × +
25 . 0
) 38 14 (
) 14 27 (
=
+
−
13 . 0
21 16 3
5
=
+ +
* Although you don’t need to know just how these numbers are stored and brought back at just
the right time, if you’re interested you can read all about it in Appendix A. By gaining a more
complete understanding of the calculator’s operation, you’ll use it more efficiently and
confidently, yielding a better return on the investment in your hp 12c.