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Every value, every result is announced by the speechoutput. To repeat the result of
the last calculation, press the Equals-key once again. If you accidentally type in a
wrong digit, just press ON-key long (3 x 3 group, row 1, right key) to delete the last
value.
5.2: Advanced Arithmetic Functions
DoubleCheck XL also offers the possibility to calculate percentages, extract square
roots or square a given number.
5.2.1: Percentages
When calculating percentages the following approaches are most common:
Calculation Example Input
Percent How much is 5% of 250? 250 x 5%
Percentage 250 is 5% of how much? 250 / 5%
Surcharges How much is 250 plus a surcharge of 5%? 250 + 5%
Rebate How much is 250 minus a rebate of 5 %? 250 – 5%
To calculate for example, how much are 5% of 250, type 250, shortly press the
multiplication key (4 x 4 group, row 2, right key) followed by the digit 5. Finish the
process by shortly pressing the percent-key (3 x 3 group, row 3, right key).
DoubleCheck XL will then announce the result.
5.2.2: Square a Given Number
To square a given number, type in the value and shortly press the squared-key (3 x
3 group, row 3, middle key) followed by the equals key.
5.2.3: Extract a Square Root
To extract a square root, type in the number and shortly press the square root key
(3 x 3 group, row 3, left key) followed by the equals key.
5.2.4: Reciprocal Value
To calculate the reciprocal value, type in a number and press and hold the percent-
key (3 x 3 group, row 3, right key) followed by the equals key.
5.2.5: To the Power of
Type in a number, press and hold the square-key (3 x 3 group, row 3, middle key)
until you hear „to the power of“. Now type in the number needed and finish the
calculation by shortly pressing the equals key (4 x 4 group, row 4, column 3).
5.2.6: Π (Pi)
To calculate with the number Pi, press and hold the square root key (3 x 3 group,
row 3, left key).
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