Calculated Industries 4090 - Manual (Page 23)

22 — ITI S
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/HVAC P
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USING PARENTHESES
Your calculator has Parentheses keys ( and ) for performing
mathematical operations. (In the Order of Operations method,
expressions inside of parentheses are performed first.)
The calculator offers four levels of parenthesis:
1) First parenthesis level opened – press ( for one Right-
Sided Parenthesis.
2) Second level opened – press ( a second time for two
Right-Sided Parentheses ( (.
3) Third level opened – press ( a third time for three Right-
Sided Parentheses ( ( (.
4) Fourth level opened – press ( a fourth time for four Right-
Sided Parentheses ( ( ( (.
As you close each level of Parenthesis, the displayed number of
Parentheses in the upper left corner of the LCD is reduced by one,
and the results of expression are displayed.