Panasonic EB-MX7 EN - Manual (Page 127)

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Tools
Calculator
You can use the 4-function calculator (addition, subtraction,
multiplication and division) to make simple arithmetic operations.
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Main menu > Tools > Calculator
1. Enter a number
To enter a decimal point: [5]
To enter a negative sign: [r]
To erase digits: [6] (Clear)
2. [1929394] to select the arithmetic
operation ([1] to multiply, [4] to add, [2]
to divide, [3] to subtract)
3. Enter a number
4. [0] (=) to calculate