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Section 1: Getting Started 21
File name: hp 12c_user's guide_English_HDPMBF12E44 Page: 21 of 209
Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm
Keystrokes Display
-
21.68
Pressing
-
subtracts the number just
entered from the number previously in
the display. The calculator displays the
result of this calculation, which is the
balance after subtracting the second
check.
10.14-
11.54
Keys in the next number and subtracts
it from the previous balance. The new
balance appears in the display. (It’s
getting rather low!)
1053+
1,064.54
Keys in the next number — the
paycheck deposited — and adds it to
the previous balance. The new,
current balance appears in the
display.
The preceding example demonstrates how the hp 12c calculates just as you would
using pencil and paper (except a lot faster!):
Let’s see this happening in a different type of calculation — one that involves
multiplying groups of two numbers and then adding the results. (This is the type of
calculation that would be required to total up an invoice consisting of several items
with different quantities and different prices.)
For example, consider the calculation of (3 × 4) + (5 × 6). If you were doing this
on paper, you would first do the multiplication in the first parentheses, then the
multiplication in the second parentheses, and finally add the results of the two
multiplications: