Here is a situation where this is especially useful. Suppose a person makes $5.85 per hour and you are asked
to calculate earnings for a day, a week, and a year. Execute the given keystrokes to find the person’s incomes
during these periods (results are shown in Figure I.4.):
Pay period Keystrokes Balance
8-hour day 5.85 8 ENTER $46.80
5-day week 5 ENTER $234
52-week year 52 ENTER $12,168
Figure I.4: ANS variable
I.1.7 The MATH Menu: Operators and functions associated with a scientific calculator are available either
immediately from the keys of the TI-82 or by the 2nd keys. You have direct key access to common arithmetic
operations ( , 2nd ,,^,2nd ABS), trigonometric functions (SIN, COS, TAN) and their inverses
( 2nd SIN , 2nd COS , 2nd TAN ),exponential and logarithmic functions (LOG, 2nd , LN, 2nd ),
and a famous constant (2nd π).
A significant difference between the TI-82 graphing calculators and most scientific calculators is that the
TI-82 requires the argument of a function after the function, as you would see a formula written in your
textbook. For example, on the TI-82 you calculate by pressing the keys 2nd 16 in that order.
Here are keystrokes for basic mathematical operations. Try them for practice on your TI-82.
Expression Keystrokes Display
2nd (3 + 4 ) ENTER 5
2 + 3 ENTER 2.333333333
2nd ABS (-) 5 ENTER 5
log 200 LOG 200 ENTER 2.301029996
2.34 2nd 5 ENTER 234000
Additional mathematical operations and functions are available from the MATH menu. Press MATH to see
the various options (Figure I.5). You will learn in your mathematics textbook how to apply many of them.
As an example, calculate by pressing MATH and then either 4
or ENTER; finally
press 7 ENTER to see 1.912931183. To leave MATH menu and take no other action, press 2nd QUIT or
just CLEAR.
3
3
7
10
x
2.34
10
5
5
x
-1
2
1
3
x
2
x
2
3
2
4
2
16
e
x
10
x-1-1-1
x
-1
x
2
I-4 Copyright © by Houghton Mifflin Company. All rights reserved. TI-82 Graphics Calculator
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