That depends what operation you need to do: you have to learn separately how to add and subtract, multiply, divide, simplify, and expand fractions. Since this is a rather long topic, I suggest you review your school books, or check some online resources. See the related links for one of them.
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Eradicate the fractions.
Fractions make no difference to absolute values.
The names of inverse operations depend on the operations, not on whether they are applied to fractions or other kinds of numbers.
because you are stupid...
You cannot solve proper fractions. You may be able to solve problems involving fractions but that is NOT the same thing. Furthermore, the solution methods depend on the problem.