There is no such number on a calculator. If you see "R" on a calculator, it is probably some calculation - for example, conversion from polar to rectangular coordinates. Check the manual for your calculator.
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This will depend on the type of calculator you have. This will depend on the type of calculator you have.
if it is a scientific calculator you just have to press replay at the top of the calculator
On a calculator screen it is eight(8) digits.
Get out calculator and divide the number by seven. If you can use a computer, use the calculator on your computer.
It depends on the calculator. A regular calculator cannot handle very much while a scientific calculator can handle larger numbers.