© 1999 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
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: A Guide for Teachers
48
Order of Operations
4
Keys
These numbered paragraphs provide
explanations for the corresponding numbered
keys on the illustration below.
1.
D
opens a parenthetical expression.
2.
E
closes a parenthetical expression.
Notes
•
The examples on the transparency
masters assume all default settings.
•
The transparency master showing the
Equation Operating System (EOS
é
)
demonstrates the order in which the
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completes calculations.
•
Operations inside parentheses are
performed first. Use
D
E
to change the
order of operations and, therefore,
change the result.
Example: 1 + 2 x 3 = 7
(1 + 2) x 3 = 9
2
1
