HP 39gs Master Guide

You can also use these memories in calculations. Type in the following,
not forgetting the
ALPHA key before the D….
(3+D)/5 ENTER
The calculator will use the value of
12 stored earlier in D to evaluate the expression (see image). In case you
haven’t worked it out for yourself, the
/ symbol comes from the divide key and the * symbol from the
multiply key
.
More information on memories and detailed information on the HOME view in general is given on pages 39.
The calculator also comes with an immense number of mathematical
functions. They can all be obtained via menus through the
MATH key or
from the keyboard. Try pressing the
MATH key now and you should
find your screen looks like the screen shot left.
The
MATH menu is covered in detail on pages 165 but we will have a brief look now.
The left side of the menu lists the categories of functions. As you use the
up/down arrows to scroll through the topics, you’ll see the actual list on
the right change. Move down through the menu until you reach Prob.
(short for Probability) and then one step more and you’ll find yourself
back at Real. Now press the right arrow key and your highlight will
move into the right hand menu (see above). Move the highlight down
through this menu until you reach Round. Press
ENTER.
You should now be back
HOME, with the function ROUND( entered in
the display as shown right. You can also achieve the same effect by
using
ALPHA to type in the word letter by letter. Many people prefer to
do it that way.
Now type in:
4+D/18,3) and press ENTER
As you can see, the effect was to round off the answer of 4
.
666666.. to
3 decimal places. Entering
ROUND(4+D/18,-3) would have rounded to
3 significant figures instead.
There are shortcuts for obtaining things from the
MATH menu that are
covered later (see page 41).
13

HP 39gs Specifications

General

Type	Scientific
Form factor	Pocket
Product color	Gray
Internal memory	0.256 MB

Weight and Dimensions

Weight	249 g
Dimensions (WxDxH)	187 x 94 x 31 mm