User's Manual

BrailleNote Apex QT User Guide
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8.3.3 Negation.
The Negation operator N is used to enter negative numbers. For example to calculate 5 divided by
negative 2 you press: 5 / N 2 ENTER
Note that the Negation operator is not the same as the subtraction operator, and that they are on
different keys on the keyboard.
8.3.4 Percent.
The Percent operator is used to calculate percentage markup or markdown. It is a special operator
that automatically evaluates the calculation without the need to press ENTER. For example,
To calculate a 20% markup on 56 press: 5 6 + 2 0 % which gives the result 67.2.
To calculate a 10% markdown on 45 press: 4 5 - 1 0 % which gives the result 40.5.
To calculate what percentage 17 is of 20, press: 17 / 20 % which gives the result 85. That is, 17 is
85% of 20.
To calculate 30% of 180 press: 180 * 30% which gives the result 54.
8.3.5 Fractions.
This section describes how to calculate fractions in KeySoft 9.0.1. It covers the entry of simple
fractions, improper fractions and mixed numbers. It also describes how to convert fractions. If you
want to use addition, subtraction, multiplication and division in an equation that includes fractions,
refer to 8.2 Entering a Calculation.
Note that the calculator memory can hold either a fraction or a decimal at any one time.
8.3.5.1 Entering Simple and Improper Fractions.
This section explains how to enter simple and improper fractions into the Scientific Calculator.
A simple fraction is a fraction in which both the numerator and denominator are integers or whole
numbers. For example, 1/2 which is spoken in KeyPlus as "1 over 2".
An improper or 'top heavy' fraction is one in which the numerator is larger than the denominator.
For example, 24/9.
To enter a simple or improper fraction, follow the steps below:
1. Enter the numerator (the top number in the fraction).