The calculation with fractions / rational numbers is possible using the setting "rat" in the calculator.
The input of fractions is done by numerator, fraction line "/" and denominator.
For the calculation with fraction numbers there are following arithmetic operations:
If the result of a calculation cannot be represented as a fraction number because either the result is not rational or an overflow in the fraction number in numerator or denominator arises the fraction calculator displays an approximated value. The number of decimal digits which are admissible for numerator and denominator is about the half precision which is set for floating-point numbers.