User's Manual

BrailleNote Apex QT User Guide
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8.2.4 Setting the Calculation Precision.
The maximum number of decimal places displayed may be set from 0 to 9. This is done by pressing
CONTROL with PERIOD followed by the desired number of digits. This does not affect the
internal precision of calculations but only the number of digits displayed.
For example to set the number of decimal places to 4, first press CONTROL with PERIOD.
KeyPlus displays: "Decimal places? (current setting)."
Press 4 and press ENTER. If you are checking the precision, just press ENTER to leave the current
setting unchanged.
8.3 Basic Operations.
The basic operations provided are:
Addition, Subtraction, Multiplication and Division
Negation, Percent, Parenthesis and Fractions.
8.3.1 Addition Subtraction Multiplication and Division.
These operations have the normal order of precedence. This means that expressions inside brackets
are evaluated first, and then division and multiplication are performed, followed by addition and
subtraction.
8.3.2 Parentheses.
Parentheses, or brackets, are used to change the order in which an equation is evaluated. For
example, the equation: 3 + 4 * 5
is evaluated by adding 3 to the product of 4 times 5. The answer is 23.
If you want the addition of 3 and 4 to occur first, and the result to be multiplied by 5, insert
parentheses around the 3 + 4, as follows: (3 + 4) * 5= 35
Parentheses can be placed wherever a number can occur. You can use up to 6 levels. If you try to
open more than 6 levels, or close more than are open, KeyPlus beeps.