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Chapter 3: Manual Calculations
3. Arithmetic Keys
There are various keys for arithmetic calculations. Use the
+
-
|
=
,
_
,
(
and
)
keys to perform
basic arithmetic calculations. Press
E
to solve an equation.
E
Executes an expression.
Example
• Calculate 1 + 2.
#
C
1
+
2
E
An expression is a mathematical statement that may use numbers
and/or variables that represent numbers. This works just like a
regular word sentence; one may ask “how are you?”, and you may
answer “okay.” But what if an incomplete sentence is thrown, such
as “how are”? You’ll wonder, “how are... what?”; it just doesn’t make
sense. A math expression needs to be complete as well.
1
×
2
,
4x
,
2sinx
×
cosx
form valid expressions, while “
1
×
” and “cos” do not. If
an expression is not complete, the calculator will display an error
message upon pressing the
E
key.
+
Enters a “+” sign for addition.
Example
• Calculate 12 + 34.
#
C
1 2
+
3 4
E
-
Enters a “–” sign for subtraction.
Example
• Subtract 21 from 43.
4 3
-
2 1
E
4. Press 505.8
|
36.
Press
E
to execute the
calculation.
Performing
addition,
subtraction,
multiplication
and division
A Note about
expressions